General C# MCQs

1. Which statement do you use to stop loop processing without a condition?

2. In C# 6 which of the following features is used to cut down on the code written to check for null values in a nested object.

3. What is a jagged array in C#?

4. Which of the following is not a bitwise operator

5. Exceptions can be handled in Csharp with a...

6. How can you access the first element from the following array int[] x = {1,2,3};

7. In order to create a filestream object in C#, what do you need to include in your program?

8. Which of the following constructs are used to handle errors in C#?

9. Choose the types of members which you can have in your C# class?

10. Exceptions can be handled in C# with a...

11. Which of the following is the recognised file extension for C# files

12. Given the following C# statement: int[] myInts = { 5, 10, 15 }; What is the value of myInts[1]?

13. If your Csharp class is called Cats, which statement creates an object of type Cats?

14. Which C# debugging tools are available to you with Visual Studio?

15. What is used in C# to terminate a statement?

16. In C#, what would you use to output the contents of a variable to the screen?

17. What type of memory management does Csharp employ?

18. True or false: A class can implement multiple interfaces

19. The purpose of the curly braces, { and }, in C#:

20. Which of the following is not a built-in data type in C#?

21. A sealed class in C# means:

22. The manifest of a C# assembly contains...

23. Which of the following symbols is used to concatenate strings

24. Csharp provides a built in XML parser. What line is needed to use this feature?

25. Can you have a single Try clause with multiple catch clauses?

26. What would the following code snippet print out: string x = 'test'; string y = 'hello'; Console.WriteLine('{0}, this is a {1}', x, y);

27. An Indexer in C# allows you to index a

28. What is the purpose of the following statement: ~myClass() ?

29. what does the expression !false evaluate to

30. Which statement is a convenient way to iterate over items in an array?

31. C# support what types of inheritance.

32. The keyword used to include libraries/namespaces in C# is:

33. Where would you find the definition for the Stack class?

34. CSharp cannot be run without installing...

35. Which classes are provided in C# for writing an XML file?

36. If you have a C# program containing a runtime error and a compile time error, which would you first be alerted to on compilation?

37. What is the following code similar to Object.Equals(Person, null)

38. What is the result of the following expression? int x = 100 / 0;

39. The Code Document Object Model can be used for...

40. The default value of a reference type is...

41. Which class provides the best basic thread creation and management mechanism for most tasks in Csharp?

42. Which of the following is an example of dot notation

43. What are the access modifiers available in C#?

44. Which option below is an Operator?

45. C# is based on which of the following languages

46. Identifiers in C# are case sensitive

47. Classes that can be used for reading / writing files like TextReader, StreamWriter, File can be found in which namespace?

48. Valid parameter types for Indexers in C# are...

49. You can attach a handler to an event by using which operator?

50. If you know that a method will need to be redefined in a derived class,

51. What does if((number <= 10) && (number >= 0)) evaluate to if number is -6?

52. Which keyword would be used in a class declaration to stop the class from being inherited?

53. Which of the following is the correct way to write C# comments

54. What is the keyword to create a condition in a switch statement that handles unspecified cases?

55. Given the following statement: public enum Days { Monday, Tuesday, Wednesday, Thursday, Friday, Saturday, Sunday }. What is the value of Monday?

56. What is the purpose of the ref keyword in C#?

57. Which of the following describes a C# interface?

58. The C# statement: using System; means...

59. If you are overloading methods in a class the methods must have...

60. var x = default(DateTime); What is the expected value of 'x'?

61. When the protected modifier is used on a class member,

62. Which classes are provided in C# for navigating through an XML file?

63. A static class in C# can only contain...

64. Can you change the value of a variable while debugging a C# application?

65. How do you specify a reverse lambda expression

66. In C#, methods with variable number of arguments:

67. Look at the following code: public delegate void EventHandler(); public static event EventHandler handler; static void Bar() { Console.WriteLine('Bar'); } Which of the following is a valid way to assign a new event handler?

68. Which of the following best describes this class definition? : public class Foo {}

69. bool test = true; string result = test ? 'abc' : def'; What is the value of result after execution?

70. Which attribute specifies a method to run after serialization occurs?

71. c => c.name == 'Ben' Is an example of:

72. What is unique about an abstract class in C#?

73. If your C# class is a static class called OutputClass, which contains public static void printMsg();, how would you call printMsg?

74. What is the full name of the type that is represented by keyword int?

75. What happens with the following lines? #region Debug [block of code HERE] #endregion

76. In C# the System.String.Format method is used for ....

77. How do we instantiate generic list of objects

78. An interface contains signatures only for

79. Which keyword is needed to compile a method in Csharp which uses pointers?

80. During the class definition, inheritance in C# is acomplished by putting which of the following:

81. Which of the following symbols allows the creation of verbatim string literals

82. When the public modifier is used on a class,

83. Reflection is used to...

84. The extern keyword is used to declare a method which is...

85. C# code is compiled in...

86. Which of the following declares your Csharp class as an attribute?

87. In CSharp, what is the default member accessibility for a class?

88. In the following array instantiation: string[] names = new string[2]; , how many items can the array hold?

89. How do you catch an exception indicating that you are accessing data outside of the bounds of the array?

90. How does a struct differ from a class in C# ?

91. The [Flags] attribute indicates that an enum is to be used as a bit field. However, the compiler will allow you to use an enum as a bit field, even without the [Flags] attribute.

92. Which of the following is not a C# keyword?

93. Which is an example of a C# main method?

94. Lambda expressions can be used a short form way to:

95. Can you have a nullable DateTime in C#?

96. How do you implement your own version of ToString() method in your class?

97. In order for the following to compile: using (CustomClass = new CustomClass()) { } CustomClass needs to implement which interface?

98. The following line of code in C#: IEnumerable aList = new List();

99. What is the default visibility for members of classes and structs in C#?

100. C# provides an XML documentation comment syntax by prefacing your comment lines with...

101. What is the full name of the base type of all the types in .NET?

102. How can you instantiate the following Abstract class 'AbClass'

103. The yield keyword is used when creating collections for iteration.

104. True or False? ushort is a signed integer.

105. What does this program output? public class Program { struct Thing { public string Color { get; set; } } public static void Main(params string[] args) { Thing one = new Thing { Color = 'Red' }; Thing two = new Thing { Color = 'Green' }; two = one; two.Color = 'Blue'; Console.WriteLine(one.Color); } }

106. A difference between a struct and a class is that...

107. Extension methods in C#...

108. In C#, if you would like to create a class across multiple files, you should precede the class definition with...

109. How many classes can a single class inherit?

110. From which class do you need to derive to implement a custom attribute?

111. Applications written in C# require the .NET framework...

112. Which of the following statements about static constructors are true?

113. Can you use pointers to manipulate memory in C#?

114. Which of the following is not a valid way to declare a new variable in C#

115. What is: #if ?

116. Converting a value type to reference type is called....

117. When dealing with currency calculations you should always use what data type?

118. In C#, a subroutine is called a ________.

119. Which line is required in your Csharp application in order to use the StringBuilder class?

120. Which key word provides a synchronization mechanism to helps make code thread safe?

121. A struct can inherit from another struct or class.

122. What is the keyword 'extends' used for?

123. 'global' is a contextual keyword that gives you access to the C# global namespace when used in conjunction with the '::' operator

124. C# is an object oriented language which does not offer...

125. What's the best practice for enumerating all the values of a Suit enum?

126. In the code below. public class Utilities : System.Web.Services.WebService { [System.Web.Services.WebMethod] public string GetTime() { return System.DateTime.Now.ToShortTimeString(); } } [System.Web.Services.WebMethod] is an example of what?

127. What is the size of a long in C#?

128. What does the following statement do? #error Type Mismatch

129. What is the name of the open source C# compiler released by Microsoft?

130. In the following statement: string[] words = text.Split(delimiterChars); what is the function of delimiterChars?

131. What is the purpose of the [STAThread] attribute?

132. Consider the following statement: string str = 'abcdefg';. How would get the length of str?

133. What description BEST suits the code below. var Dictionary = new Dictionary<string, int>(StringComparer.OrdinalIgnoreCase);

134. What is the result of the following code ? interface IFoo1 { void meth1(); } interface IFoo2 { void meth1(); } public class f : IFoo1, IFoo2 { void IFoo1.meth1() { Console.WriteLine("Hi1"); } void IFoo2.meth1() { Console.WriteLine("Hi2"); } public void meth1() { Console.WriteLine('Hi3'); } void Main() { IFoo1 f1 = new f(); IFoo2 f2 = new f(); f f3 = new f(); f1.meth1(); f2.meth1(); f3.meth1(); }

135. Which C# statement is equivalent to this: int myInt = new int(); ?

136. Which keyword would be used in the class definition if we did not want to create an instance of that class?

137. Is the following code valid? string x = 'test'; for (; x == 'test'; ) { x = 'not test'; }

138. What will be the output of the following C# code: int num = 1; Console.WriteLine(NUM.ToString());

139. In C#, simple types like int, char, bool etc has member functions.

140. What does the params method keyword do?

141. string is a mutable data type

142. Which of the following cannot be included in a method which contains a yield

143. Consider the following C# code: int x = 123; if (x) { Console.Write('The value of x is nonzero.'); } What happens when it is executed?

144. what is the output for the following code Console.WriteLine(sizeof(float));

145. The built-in string class in C# provides an immutable object which means...

146. True or False: We can create a sealed abstract class in c#.

147. The expression: var ? count = 0;

148. What is the purpose of the Task class?

149. What will be printed on the console when the following program is executed: public static void Main(string[] args) { bool foo = new bool(); if (foo) Console.WriteLine('True'); else Console.WriteLine('False'); }

150. How do you declare a generic method that takes one parameter which must be a value type?

151. What is the result of the following code? var a = 3; a = 'hello'; var b = a; Console.WriteLine(b);

152. What namespaces are necessary to create a localized application?

153. Will the following code compile? public class CustomClass : IDisposable { }

154. What does the Obsolete attribute do when used in conjunction with a class?

155. Why won't this code compile class A { private int i; public int P { get { return i; } set { i = value; } } public int get_P() { return i; } public void set_P(int i) { this.i = i; } }

156. Which of the following is NOT a value type?

157. Given the following code : void Main() { var x = 123; Task t = new Task(()=>{ x++; }); t.Start(); Console.WriteLine(x.ToString()); } What is the expected value of x ?

158. Proper way of defining an extension method for a string class in C# is:

159. int[] myArray = new int[10]; What will be the value of myArray[1]?

160. Can Abstract class support constructors ?

161. What is the main difference between ref and out parameters when being passed to a method?

162. Interfaces in C# cannot contain:

163. Consider the following code snippet: public class A {...} public class B: A {...} public class C:B {...} then from the following options, which one will give a compile time error?

164. Given the method: static int Foo(int myInt, params int[] myInts, int myOtherInt) { if (myInt > 1) return myOtherInt; foreach (dynamic @int in myInts) myInt += @int; return myInt + myOtherInt; } What will 'Foo(1, 2, 3, 4, 5)' return?

165. All of the following are valid c# keywords: unchecked, extern,volatile, string, unsafe, implicit, virtual, stackalloc

166. Are bool and Boolean equivalent?

167. The primary expression for initializing an anonymous object in C# is in the form of:

168. In C#, 'implicit' keyword is used to:

169. Consider the following code: static void Set(ref object value) { value = 'a string'; } static void Main(string[] args) { object value = 2; Set(ref value); } After the call to 'Set', what will the value in 'value' be?

170. Which of the following is true of calling a virtual method in a constructor:

171. int a = 5; for (int i = 0; i < 3; i++) { a = a - i; } What is the value of the variable a after the code runs?

172. Which of the following is NOT reference type?

173. What is the purpose of [Flags] attribute?

174. In C#, 'explicit' keyword is used to:

175. What will be the result of running the following code : void Main() { Perform(Inp); } public string Inp(string s1, string s2) { return s1 + s2; } public void Perform(Func inp) { Console.WriteLine(inp('Hello', ',World')); }

176. What does the attribute [Conditional('DEBUG')] on a method indicate?

177. What does the following code do? string a = 'hello'; string b = null; string c = a + b; Console.WriteLine(c);

178. In C# 'new' keyword is used to...

179. What does the following code output? ------------------------------------------------ using System; using System.Collections.Generic; public class Program { public static void Main() { var dictionary = new Dictionary(); bool isAlive = true; dictionary.TryGetValue('Jaberwocky', out isAlive); Console.WriteLine(isAlive); } }

180. What is wrong with this code: public enum @enum : ushort { Item1 = 4096, Item2 = 8192, Item3 = 16384, Item4 = 32768, Item5 = 65536, }

181. In C#, difference between 'new' and 'override' is:

182. Which answer is not a valid C# 4.0 variable definition?

183. Polymorphism. LET: public class BaseClass { public string DoWork() { return 'A'; } } public class DerivedClass : BaseClass { public new string DoWork() { return 'B'; } } IF: DerivedClass B = new DerivedClass(); BaseClass A = (BaseClass)B; A.DoWork(); What's the resulted output?

184. What will happen if the requested type conversion is not possible when using an 'as' operator ?

185. Which statement is True?

186. The main reflection methods to query attributes are contained in the...

187. Which of the following expressions give a compile time error?

188. You are creating a class to compare a specially formatted string. You need to implement the IComparable<string> interface. Which code segment should you use?

189. Byte b1 = 1; Byte b2 = 2; Console.WriteLine(b1 + b2);

190. How many generations does the garbage collector in .NET employ?

191. What does the @ symbol do when used in C# code?

192. The following program is expected to run, and after 500 ms write 'OK' and exit, but fails to do that. How would you fix this? class Test { int foo; static void Main() { var test = new Test(); new Thread(delegate() { Thread.Sleep(500); test.foo = 255; }).Start(); while (test.foo != 255) ; Console.WriteLine('OK'); } }

193. How does LINQ lambda syntax differ from LINQ query syntax in terms of capabilities?

194. String a = 'hello'; String b = 'hello'; var answer = object.ReferenceEquals(a, b); What is the value of answer?

195. Which of the following keywords is not reserved in C#

196. What can lambda expressions be turned into by the C# compiler

197. In the context of (A | B) and (A || B), the (A || B) boolean evaluation is known as what?

198. If you have this in your configuration: What does the output look like for this code: var someSetting = ConfigurationManager.AppSettings['SomeSetting']; Console.WriteLine('SomeSetting is {0} and is of type {1}', someSetting, someSetting.GetType().Name);

199. Given the following code: var result = 7/2; what will be the value of result?

200. var a = new { name = 'Frank', age = 22.5 }; var result = a.GetType() == new { name = 'Bob', age = 64.1f }.GetType(); what is the value of result?

201. When comparing strings, which of the following Enum Type is utilized to specify the comparison culture and whether or not it will ignore the case of the string?

202. What does the abbreviation `SOLID` mean.

203. Which of the following is a correct way to declare a pointer in C#?

204. In C#, what is the difference between: 'int[,] arrayName;' and 'int[][] arrayName;'

205. Polymorphism. LET: public class BaseClass { public virtual string DoWork() { return 'A'; } } public class DerivedClass : BaseClass { public override string DoWork() { return 'B'; } } IF: DerivedClass B = new DerivedClass(); BaseClass A = (BaseClass)B; A.DoWork(); What's the expected output?

206. Which of the following keywords belongs to C#

207. What is the result of the following code : void Main() { var r=0; Task t = Task.Run(() => { return 1; }).ContinueWith((i) => { r= i.Result+1; return 1; }); Console.WriteLine('{0},{1}',t.Result,r); }

208. It is possible to overload the '=' operator in C#.

209. If A = true and B = false, how does [1.] (A | B) differ from [2.] (A || B)

210. What is the output of Console.WriteLine(10L / 3 == 10d / 3);?

211. What will be the output of the following code: public delegate void TestDel(); class Program { static void Main(string[] args) { Program prog = new Program(); Foo foo = prog.FooGetter(); if (object.Equals(foo, null)) { Console.WriteLine("Uh-oh, something went wrong"); } else { Console.WriteLine(foo.x.ToString()); } Console.ReadLine(); } public Foo FooGetter() { Foo result = null; Bar bar = new Bar(); bar.TestDel += async () => { result = await Foo.GetFoo(); }; bar.DoStuff(); return result; } } public class Foo { public int x { get; set; } public async static Task<Foo> GetFoo() { //Code omited. This method takes approx 3 seconds //to run. This will ALWAYS return a Foo object with an //x value of 1. } } public class Bar { public event TestDel TestDel; public void DoStuff() { TestDel.Invoke(); } }

212. Can multiple catch blocks be executed?

213. What is the value of Status.TiredAndHungry? public enum Status { Unknown = 0, Sick = 1, Tired = 2, Hungry = 4, TiredAndHungry = Tired | Hungry }

214. Having the following code , what will be the result ? public class Animal { public void Walk() { Console.WriteLine('Animal is walking'); } } public class Dog : Animal { public new void Walk() { Console.WriteLine('Dog is walking'); } } void Main() { Animal cat = new Animal(); Dog dog = new Dog(); Animal adog = new Dog(); cat.Walk(); dog.Walk(); adog.Walk(); }

215. What is the result of following function? public bool SomeTest(){ return 'i like c#'.ToUpper().Equals('I LIKE C#'); }

216. What is the output of following program? class Program { public enum Colors { Red = 1, Green = 2 } private static void Main() { Colors c = 0; Console.WriteLine(c); } }

217. C# provides Finalize methods as well as destructors, unlike Java. Which of the following is true about it?

218. Which are not function members in a C# class?

219. True or False? Changing interfaces to base classes with virtual methods can NOT improve performance of method invocations.

220. The where condition for the generic definition should be changed to ensure that the code will compile. class MyClass<V> where V :class, IComparable { public void foo() { V aClass = new V(); } } class Program { public static void Main(string[] args) { } } How should the where condition be changed?

221. Which of the following technologies are used to build dynamic queries?

222. Does return 10 as long; compile?

223. Assuming the local system time offset is UTC+5, what does the following program output? using System; public class Program { public static void Main() { DateTime time1 = new DateTime(2000, 1, 1, 10, 45, 0, DateTimeKind.Local); DateTime time2 = new DateTime(2000, 1, 1, 10, 45, 0, DateTimeKind.Utc); TimeSpan span = time2 - time1; Console.WriteLine(span); } }

224. What will be the output of the following program? class Program { public class Base { public Base() { Console.WriteLine("Parameterless constructor"); } public Base(int x) : this() { Console.WriteLine("Constructor with parameter {0}",x); } static Base() { Console.WriteLine('Static constructor'); } } static void Main(string[] args) { var one = new Base(5); var two = new Base(6); } }

225. Which one of the following classes are present System.Collections.Generic namespace? 1) Stack 2) Tree 3) SortedDictionary 4) SortedArray

226. What is the expected output? static void Main() { object o = -10.3f; int i = (int)o; Console.WriteLine(i); }

227. In C# simple types like int, char and bool are aliases for predefined classes in the System namespace.

228. abstract class BaseClass { public abstract Color Color { get { return Color.Red; } } } sealed class Blues: BaseClass { public override Color Color { get { return Color.Blue; } } } BaseClass test = new Blues(); What is the result of test.Color ?

229. What will be the result of the following code: float f = 1.5; Console.WriteLine(f);

230. Which of the following is the correct way to specify a decimal

231. Which is the correct way to escape braces {} while using string.Format.

232. [Flags] enum Days{ None=0x0, WeekDays=0x1, WeekEnd=0x2 } Days workingDays = Days.WeekDays | Days.WeekEnd; How do you remove the Days.WeekEnd from the workingDays variable?

233. What will the following program print on the console: static void Main(string[] args) { var i = typeof(void); Console.WriteLine(i.Name); }

234. Which of the following suffixes is used for a numeric real literal to be treated as a decimal?

235. Which of the following will set the process return code to 1?

236. What is the output of the following code snippet. public class ClassOne { public ClassOne(int id, string name, bool isTest) { this.ID = id; this.Name = name; this.IsTest = isTest; } public int ID { get; private set; } public string Name { get; protected set; } protected bool IsTest { get; internal set; } } public void Run() { ClassOne one = new ClassOne(1, 'John', false); Console.WriteLine(one.Name); }

237. What does the following code do? unchecked { int i = Int32.MaxValue; int j = i; int product = i * j; Console.WriteLine(product); }

238. In CQS (Command Query Separation)... which statements are NOT correct?

239. What will be the console output when running the 'Main' method ? static void Main(string[] args) { Car firstVehicle = new Bus(); Car secondVehicle = new Motorcycle(); Console.WriteLine(firstVehicle.GetPassengerCount()); Console.WriteLine(secondVehicle.GetPassengerCount()); } internal class Car { internal virtual int GetPassengerCount() { return 4; } } internal class Bus : Car { internal int GetPassengerCount() { return 8; } } internal class Motorcycle : Car { internal override int GetPassengerCount() { return 1; } }

240. What will be the output of the following program: #define DEBUG using System; using System.Diagnostics; class Program { [Conditional('DEBUG')] public static bool Print() { Console.WriteLine('Printed'); return true; } public static void Main(string[] args) { Print(); } }

241. What is operator overloading

242. void Disagree(ref bool? maybe) { maybe = maybe ?? true ? false : maybe; } When calling this method, the value of the reference parameter will be changed to:

243. What is the output of following program? class Program { public enum Colors : System.Int32 { Red = 0, Green = 1 } private static void Main() { Console.WriteLine(Colors.Green); } }

244. About ECMA or ISO/IEC specifications which sentence is correct?

245. enum Score { Awful, Soso, Cancode } Given the enum above, which statement(s) will generate a compiler error?

246. namespace DocGen { class Skills { public void Test(T t) { } } } According to C# standards and specifications, the documentation generator ID string corresponding to 'Test' method from the code above should be:

247. What is the output of the following program? class Program { static void Main() { int? number = null; Console.WriteLine(number.ToString()); } }

248. What does the following statement do: delegate double Doubler(double x); ?

249. Byte b1 = 254; Byte b2 = 1; Byte b3 = b1 + b2; Console.WriteLine(b3);

250. int keyword is representing which .Net type?

251. What is Assembly?

252. A class that cannot be inherited is what type of class?

253. What does the sealed keyword mean when applied to a method in C#?

254. True or False: It is true that string a reference type?

255. Which method of the SQLDataAdapter object can be used for data retrieval?

256. How does an interface differ from a class?

257. What modifier to add instead of '....' to become a true code? public class ClassA { .... int x = 10; } public class Program : ClassA { static void Main(string[] args) { ClassA ob = new ClassA(); Program cc = new Program(); cc.x = 12; ob.x = 19; } }

258. What is the difference between Convert.ToString() and ToString()?

259. What is boxing in .Net?

260. What will be the output of the following code: Console.WriteLine(('?' ?? '???') == '?' ? '??' : '???');

261. Choose the correct answer for: (1) var _Results = from item in _List where item.Value == 1 select item; (2) var _Results = _List.Where(x => x.Value == 1);

262. What is the result of program: uint x = 0; Console.WriteLine(~x > 0);

263. Which type of control inherits from the Control class without graphical representation?

264. In C#, the following keyword used to allocate the for a class's instance is?

265. int a = 1, b = 1; b = ++a; What is the b?

266. In C#, the keyword used to create an object to a class or struct is?

267. Can you allow a class to be inherited, but prevent the method from being overridden?

268. Which one of the given examples is correct if I want the class Car inherit the class Vehicle?

269. Which symbol is used to prefix a preprocessor directive?

270. In C#, the method used to sort an array in the ascending order is?

271. Can you prevent your class from being inherited by another class?

272. What is the GAC?

273. What keyword prevents a class from being inherited by another class?

274. A String is a Value Type.

275. True or False: Strings in C# are immutable?

276. Which of the following is something that C# Generics do not do?

277. What will be the output of the code below? int total = 8 - 4 + 4 + 2 * 2;

278. To build .NET applications, you must install Visual Studio.

279. Consider the following catch block: try { // code that throws an Exception } catch( Exception e) { // Question: What is the difference between throw e; // and throw; }

280. What will be the output of the following code : public static void Main() { int value = 1; Task t1 = Task.Run(() => { if (value == 1) { Thread.Sleep(1000); value = 2; } }); Task t2 = Task.Run(() => { value = 3; }); Task.WaitAll(t1, t2); Console.WriteLine(value); Console.ReadLine(); }

281. What will be the output of the following code ? public delegate TextWriter tw(); public static StringWriter stw() { return new StringWriter(); } public static StreamWriter sw() { return null; } public static void Main() { tw t = sw; t += stw; var tt = t(); Console.WriteLine(tt == null ? "Null" : "Not null"); }

282. What is the result of the following code ? public static void Main() { Derived2 d = new Derived2(); Console.WriteLine(d.GetTempValue()); } public class BaseClass { public virtual int GetTempValue() { return 1; } } public class Derived1 : BaseClass { public sealed override int GetTempValue() { return 2 * base.GetTempValue(); } } public class Derived2 : Derived1 { public sealed override int GetTempValue() { return 2 * base.GetTempValue(); } }

283. A delegate inherits from:

284. what are the strengths of a SortedSet

286. What will be the result of the following code ? public static void Main() { try { var s = '200'; var i = int.Parse(s); if (i == 200) Environment.FailFast("i is equal to 200"); } catch (Exception ex) { Console.WriteLine(ex.Message); } finally { Console.WriteLine('done!'); } }

287. In System.Collections.Generic.Queue, what method is used to RETRIEVE, but NOT REMOVE, the item at the beginning of the queue?

288. How much memory is allocated for type of uint

289. A local variable in a method of a class can be declared volatile.

290. What will be the output of the following code ? void Main() { int? x = null; int y = x ?? -1; Console.WriteLine(y); }

291. Which option is an Reference type?

292. Which namespace is required to use Generic List?

293. You can create your own implicit and explicit user-defined conversions.

294. You have a class that implements two interfaces that both have a method with the same name. Interface IA should be the default implementation. Interface IB should be used only in special situations. How do you implement those interfaces?

295. Reference type memory is allocated from...

296. Is overriding of a function possible in the same class?

297. Which is a primary difference between abstract and virtual methods?

298. What is the keyword used to get the size of the value types in bytes?

299. In C#, the method used to find the position of character in a string is?

300. How much memory is allocated for type of decimal

301. False or True? Tuple is faster than KeyValuePair in every test, except in allocation performance.

302. Does C# support multiple inheritance?

303. What is GC?

304. Which keyword is used to terminate the execution at a particular stage of a statement?

305. Which option is an Value type?

306. Is String is Value Type or Reference Type in C#?

307. Look at this code: foreach (int value in names) { // point A if (value == 23) { break; } // point B /* other code here */ } // point C Where will the break statement cause execution to transfer to?

308. What is the main difference between these two declarations? var text1 = 'hello'; dynamic text2 = 'hello';

309. Consider this method. static void SetupHandler(OrderProcessor orderProcessor) { string itemName = 'Pluralsight Subscription'; // AddOrder is an event orderProcessor.AddOrder += (sender, e) => Console.WriteLine('Item: ' + itemName); } What will happen when the AddOrder event is subsequently raised?

310. The C# built-in types include numeric types (int, double, etc.), char, bool and string. Which of these types can you use the < and > (less than and greater than) operators on?

311. If arr is an array of int, how can you obtain the number of elements in arr?

312. What is the main difference (if any) between a while loop and a do .... while loop?

313. What must be different between different overloads of a method?

314. What is the difference, if any, between x && y and x & y ?

315. What keyword do you use inside a switch statement to handle any cases not explicitly specified by case clauses?

316. A class declared in a namespace can be declared as public, for example namespace People { public Employee { /* ... */ } } Which other access modifiers could alternatively be applied to this class, instead of public?

317. What do the following two lines of code demonstrate? string Substring (int startIndex) { /* ... */ } string Substring (int startIndex, int length) { /* ... */ }

318. What does this statement do? using System;

319. What will the following code display? int p = 10; Console.WriteLine(p is long);

320. Given the following statement: public enum Days { Monday, Tuesday, Wednesday, Thursday, Friday, Saturday, Sunday } What is the numeric value of Days.Wednesday?

321. Write the following LINQ query using method syntax. var shortNames = from name in names where name.Length < 4 orderby name select name;

322. Which statement allows System.Windows.Forms.MessageBox to be referred to simply as MsgBox?

323. Which of these shows the correct way to write a foreach loop?

324. An ErrorLog class contains the following member: ~ErrorLog() { CleanupResources(); } When will this member be invoked?

325. Which of the following is a correct example of an auto-implemented property?

326. What would be the results of the following expressions if zero is an int and contains the value 0? int x = 100 / zero; int y = unchecked (100 / zero);

327. How could you abbreviate the following code? if (userResponse == 'y') count = 10; else count = 0;

328. Which of the following types of cursors is available with ADO.NET DataReader object?

329. Which of the following is a benefit derived from using OOP(Object Oriented Programming) concepts?

330. Which access specifier will you use to make base class members accessible in the derived class and not accessible for the rest of the program?

331. ___________ namespace is not defined in the .NET class library.

332. Which of the following language code is not 'managed' by default in .NET framework?

333. Which of the following is/are true for events?

334. What will be the values of i, j and k after executing the following set of statements? int i, j, k; i = 4; j = 30; k = 0; k = j++ / i++;

335. Which of the following statements are correct?

336. Which of the following has the lowest precedence?

337. .NET framework has data providers for:

338. Which of the following are not valid Arithmetic operators?

339. Which access specifier allows only the containing class to access a data member?

340. Which of the following are reference type data in C#?

341. Which of the following statements can be used for declaring a two dimensional array?

342. What happens when the continue keyword is encountered in a for loop?

343. What happens if you use Statement 2 instead of Statement 1? Statement 1: if(nCount == 0) Statement 2: if(nCount = 0)

344. Which of the following statement regarding switch-case is false?

345. Which of the following command types are provided by an oledb and sql provider?

346. How can you define a function in a derived class having the same name as a non-virtual function in the base class?

347. Which of the following methods is ideally suited for retrieving the value of particular column from a particular row on a table in the database?

348. C# has a keyword called 'int'. Which .NET type does this map to?

349. Which of the following are the benefits of CLR?

350. What is an Object in Object Oriented Programming?

351. In the sample code given below, which of the data members are accessible from class Y? class X { private int i; protected float f;public char c;}class Y : X { }

352. Which of the following is capable of returning multiple rows and multiple columns from the database?

353. Which of the following statements is true for a DataSet?

354. The XML web services of the .NET framework are built on:

355. Which of the following is NOT a relational and type testing operator?

356. Which of the following statements is correct with regard to .NET framework managed web pages?

357. What is Encapsulation?

358. What will be the output of the following code? int[] nNumArr = {1, 2}; foreach (int temp in nNumArr) {temp++; Console.WriteLine(temp);

359. What is wrong with the code given below: class CCheck{ public static void Main()   {   int nLen = 5;   int[] arrNum = new int[nLen];   } }

360. You have to update some values in the database. Which of the following methods would you execute on a SqlCommand object named 'cmdUpdate' the CommandType for which is CommandType.StoredProcedure?

361. Which of the following statements is incorrect with regard to a SQLCommandBuilder object?

362. Which of the following is not true?

363. Can you define your own Exception classes?

364. Which of the following are not valid arithmetic operators?

365. Which of the following define the rules for .Net Languages?

366. Which of the following is true for CLR?

367. What are the core components of the .Net framework data provider model?

368. Which of the following has the highest precedence?

369. Which of the following is false with regard to interfaces?

370. Dot NET Framework programs are compiled into CPU independent instruction set, named:

371. Which of the following statements are correct about a C# class?

372. In C#, can you define global functions that are not associated with a particular class?

373. How can an abstract function be declared?

374. Which object oriented concept is related to the derivation of a class based on another class?

375. Which of the following statements is NOT true about the UNIQUE constraint of SQL Server 2008?

376. Which of the following define the rules for .NET Languages?

377. Suppose there is a List of type Person with a property of LastName(string) and PopulateList is a function which returns a Generic List of type Person: List people = PopulateList(); What does the statement below do? people.Sort((x, y) => string.Compare(x.LastName, y.LastName));

378. Which of the following will correctly remove duplicates from a List?

379. Is it possible to define custom Exception classes in C#?

380. Which type of class members are associated with the class itself rather than the objects of the class?

381. What is the syntax required to load and use a normal unmanaged windows DLL (e.g. kernel32.DLL) in a managed .NET C# code?

382. What is the output of the following code? class Test { static void Main() { string myString = '1 2 3 4 5' myString = Regex.Replace(myString, @'\s+', ' '); System.Console.WriteLine(myString); }

383. Which of the following will block the current thread for a specified number of milliseconds?

384. What is the problem with the following function, which is supposed to convert a Stream into byte array? public static byte[] ReadFully(Stream input) {    using (MemoryStream ms = new MemoryStream())     {       input.CopyTo(ms);         return ms.ToArray();     } }>

385. Which of the following functions are used to wait for a thread to terminate?

386. What is the benefit of using a finally{} block with a try-catch statement in C#?

387. In which of the following namespaces is the Assembly class defined?

388. Which of the following statements is true regarding predicate delegates in C#?

389. Working with a list of Employees: List lstEmployees = new List { new Employee{Name='Harry,Age=15}, new Employee{Name='Peter',Age=22}, new Employee{Name='John',Age=45}, new Employee{Name="Harry",Age=15}, new Employee{Name="Peter",Age=22}, new Employee{Name='John',Age=45}, }; It is required to filter out employees having distinct names. Which one of the following options cannot be used?

390. What are the benefits of using the ExpandoObject class over a using dictionary?

391. What will be the output of the following Main program in a C# console application (Assume required namespaces are included): static void Main(string[] args)        {     int @int = 15;            Console.WriteLine(@int);           Console.ReadLine();        }

392. What is the purpose of the catch block in the following code? try {     // Code that might throw exceptions of different types } catch {     // Code goes here }

393. Which of the following is true about friend functions in C#?

394. Which of the following statements is true about the code below? string[] lines = theText.Split(new string[] { Environment.NewLine }, StringSplitOptions.None);

395. Consider the following code: string s1 = 'Old Value'; string s2 = s1; s1 = 'New Value'; Console.WriteLine(s2); What will be the output printed, and why?

396. What will be the output if in a WinForms application, the following code is executed in the Load event of a form? Assume this form has lblMessage as a Label Control. private void Form1_Load(object sender, EventArgs e) { try { ThreadPool.QueueUserWorkItem(ShowMessage,null); } catch (Exception ex) { } } private void ShowMessage(object obj) { try { lblMessage.Text = 'Hello from Thread Pool'; } catch (Exception ex) { } }

397. Where does a C# assembly store the information regarding the other external dependencies, such as satellite assemblies, global assemblies etc, and their versions so that they can be loaded correctly when the assembly is executed?

398. Which of the following will output the string below?

399. Complete the following sentence: In C#, exception handling should be used...

400. The global assembly cache:

401. Which statements will give the path where the executing assembly is currently located?

402. In C#, can global functions that are not associated with a particular class be defined?

403. Which of the following is true for CLR?

404. Performance-wise, which of the following is the most efficient way to calculate the sum of integers stored in an object array?

405. Consider the following code block: public class Person {     public string GetAge()     {        lock (this)         {            // Code to get Age of this person object.         }     } } Which of the following statements is true?

406. The ___________ namespace is not defined in the .NET class library.

407. Which of the following is true about constructors and member functions?

408. Which of the following language code is not 'managed' by default in .NET framework?

409. There is a class that has a public int counter field that is accessed by multiple threads. This int is only incremented or decremented. To increment this field, three thread-safe approaches are mentioned below: A) lock(this.locker) this.counter++; B) Interlocked.Increment(ref this.counter); C) Change the access modifier of counter to public volatile Which statement is incorrect with regards to these approaches?

410. What will happen if the following code is compiled in .NET 4 or above (Assume required namespaces are included)? public class var { } public class main     public static void main(string[] args)     {    var testVar = new var(); }}

411. Which object oriented term is related to protecting data from access by unauthorized functions?

412. One of the ternary operators provided in C# is:

413. What type of code is written to avail the services provided by Common Language Runtime?

414. The .NET Framework consists of:

415. An enum is defined in a program as follows: [Flags] public enum Permissions { None = 0, Read = 1, Write = 2, Delete = 4 } What will be the output of the following Main program (which has access to the enum defined above) in this C# console application (Assume required namespaces are included) : static void Main(string[] args) { var permissions = Permissions.Read | Permissions.Write; if ((permissions & Permissions.Write) == Permissions.Write) { Console.WriteLine("Write"); } if ((permissions & Permissions.Delete) == Permissions.Delete) { Console.WriteLine('Delete'); } if ((permissions & Permissions.Read) == Permissions.Read) { Console.WriteLine('Read'); } Console.ReadLine(); }

416. Which of the following keywords prevents a class from being overridden further?

417. Suppose a class is declared as a protected internal: protected internal class A Which statement is correct with regards to its accessibility?

418. Which of the following is the correct way to randomize a generic list of 75 numbers using C#?

419. What is the output of the following code: class CCheck { public static void Main() { string str = @'E:\\RIL\\test.cs'; Console.WriteLine(str); } }

420. What is the issue with the following function? public string GetName(int iValue) { string sValue = '0'; switch (iValue) { case 1: sValue = iValue.ToString(); case 2: sValue = iValue.ToString(); break; default: sValue = '-1'; break; } return sValue; }

421. What will be the output of the following Main program in a C# console application (Assume required namespaces are included): static void Main(string[] args) { for (int i = 0; i < 1; i++) { Console.WriteLine('No Error'); } int A = i; Console.ReadLine(); }

422. What is the difference between int and System.Int32 CLR types?

423. What will be the return value if the function fn is called with a value of 50 for the parameter var? public int fn(int var) {     int retvar = var - (var / 10 * 5);     return retvar; }

424. Which of the following code snippets converts an IEnumerable into a string containing comma separated values?

425. Which of the following is true regarding a null and an empty collection in C#?

426. Which of the following statements are true regarding the ref and out parameters in C#?

427. What is the difference between the String and StringBuilder class objects with respect to mutability?

428. Which of the following code samples will create a comma separated list from IList or IEnumerable?

429. What is the advantage of using IList over List?

430. What are Satellite assemblies in C# .NET?

431. Which of the following code samples will execute a command-line program in C# and return its STD OUT results?

432. Which of the following statements is true about IEnumerable?

433. An Interface represents which kind of relationship?

434. Why is it a bad practice to use iteration variables in lambda expressions?

435. Which of the following code samples will check if a file is in use?

436. Which of the following statements is true regarding the code samples below? try {   // code goes here } catch (Exception e) {   throw e; } B: try {   // code goes here } catch (Exception e) {  throw;}

437. Which of the following is the correct way to implement deep copying of an object in C#?

438. What will be the output of the following Main program in a C# console application (Assume required namespaces are included)? static void Main(string[] args) { string Invalid = '$am$it$'; string sResult = Invalid.Trim(new char[]{'$'}); Console.WriteLine(sResult); Console.ReadLine(); }

439. Which of the following is the correct way to perform a LINQ query on a DataTable object?

440. What is the purpose of the vshost.exe file in Visual Studio?

441. Which of the following code snippets for catch shows a better way of handling an exception? 1. catch (Exception exc) {    throw exc; } 2. catch (Exception exc) {     throw; }

442. What will be the value of result after these two statements?   int num1 = 10, num2 = 9;   int result = num1 ^ num2;

443. What will be the output of the following Main program in a C# console application (Assume required namespaces are included)? static void Main(string[] args) { string sPrint = String.Format('{{ My name is bond. }}'); Console.WriteLine(sPrint); Console.ReadLine(); }

444. What is the difference between data types 'System.String' and 'string' in C#?

445. Which of the following is the correct code to close all references to the com objects below? Workbooks books = excel.WorkBooks; Workbook book = books[1]; Sheets sheets = book.WorkSheets; Worksheet ws = sheets[1];

446.

Which of the following is the correct way to sort a C# dictionary by value?

447. Consider the following code: public class ClassPoint { public int X; public int Y; public ClassPoint(int a, int b) { X = a; Y = b; } } public struct StructPoint { public int X; public int Y; public StructPoint(int a, int b) { X = a; Y = b; } } public class Test { static void Main(string[] args) { ClassPoint a = new ClassPoint(10, 10); ClassPoint b = a; a.X = 100; StructPoint c = new StructPoint(10, 10); StructPoint d = c; c.X = 100; Console.WriteLine(b.X.ToString() + ',' + d.X); } } What will be the output printed on the screen?

448. Which of the following is the correct way to find a string within a string while being case insensitive?

449. The number of objects of a given class that exist can be tracked by a introducing a class member variable. Which one of the following solutions allows for this behavior?

450. How can a single instance application be created in C#?

451. What is the difference between Expression> and Func?

452. What 'additional configuration' is necessary to reference a .NET 2.0 mixed mode assembly in a .NET 4.0 project?

453. Which of the following are true?

454. What is the best way to re-throw an exception?

455. Why must both == and != be defined in C#?

456. What is the output of the following code snippet? decimal roundedValue1 = Math.Ceiling(-2.5m); decimal roundedValue2 = Math.Ceiling(2.5m); Console.WriteLine(roundedValue1); Console.WriteLine(roundedValue2);

457. Which of the following are reference data types in C#?

458. Which of the following creates an instance of a generic type, in a function which has no parameters?

459. Which of the following implements the ISerializable interface?

460. What happens when the below code is executed? abstract class Shape { public abstract void draw(); }class Rectangle: Shape{  public override void draw();   //Some more member functions.....}class CCheck{ public static void Main() {    Shape objShape;  } }

461. Complete the following sentence: When unboxing occurs...

462. Asynchronous execution is supported in ADO.NET 2.0 for?

463. _____________ helped overcome the DLL conflict faced by the C# language versions prior to .NET.

464. What is an Action delegate?

465. What is the difference between an abstract and a virtual function in C#?

466. Which of the following code snippets will call a generic method when the type parameter is not known at compile time?

467. Which of the following  is the best way to iterate over a Dictionary in c#?

468. Which of the following can be used to expose a method as a filed to the outside world?

469. Can a function be overload with the same number and types of arguments (parameters), but with a different return type?

470. Which is the following is the correct way to convert a Byte Array to a Hexadecimal string, and vice versa?

471. Which of the following is the correct statement to combine two URL(s)?

472. If i == 0, why is (i += i++) == 0 in C#?

473. Which of the following are not C# value types?

474. Which of the following is the best way to measure the performance of a function?

475. Two users, Monique and James are using an MIS system implemented using ADO.NET. The data refresh time in the system is set to 15 minutes. James changed the mailing address of a customer named Majda, and updated the database. Before the database refresh, Monique also updated the same customer's address as per her pending requests folder. What will happen when Monique saves the changes?

476. In the .NET framework, what are the options available for packaging?

477. What will be the value of the result variable after these two statements? int num1 = 10, num2 = 9; int result = num1 & num2;

478. What is the output of the following code snippet? public class MyClass { public int X { get; set; } } public struct MyStruct { public int X { get; set; } } class Program { static void Main(string[] args) { MyClass classObj1 = new MyClass(); classObj1.X=12; MyClass classObj2 = classObj1; classObj2.X = 15; Console.WriteLine(classObj1.X); Console.WriteLine(classObj2.X); MyStruct structObj1 = new MyStruct(); structObj1.X = 12; MyStruct structObj2 = structObj1; structObj2.X=15; Console.WriteLine(structObj1.X); Console.WriteLine(structObj2.X); Console.ReadLine(); } }

479. What does the following function signature denote? public static intCharLength(this string inputStr)

480. What is the purpose of ?? (Two question mark) in C#? Example : Class object ??= new Class();

481. Consider the following statements and pick the most appropriate option: Statement 1: Value type variables store their data on the heap. Statement 2: Reference type variables store their data on the stack.

482. How can a function be defined in a derived class having the same name as a non-virtual function in the base class?

483. Which of the following statements are false regarding the 3 timer classes provided by the .NET framework? a) System.Windows.Forms.Timer b) System.Timers.Timer c) System.Threading.Timer

484. Which of the following statements is correct about the ref and out keywords?

485. Which of the following is the best way of creating a generic method constraining T to an Enum?

486. What are the general kinds of XAML elements?

487. Choose the correct statements about the LINQ?

488. Choose the correct statement about process-based multitasking?

489. What does the following declaration specify? MethodInfo[] GetMethods()

490. Select the type of multitasking methods that exist?

491. Which of the following is not a relational operator in C#?

492. What is multithreaded programming?

493. Consider the following declaration in C#, Which statement is true about this declaration? int[][] array;

494. What will happen if the value of nNum is 2 and the following code is compiled and executed? switch(nNum) { case 1: Console.WriteLine('nNum = 1'); break; case 2: Console.WriteLine('nNum = 2'); default: Console.WriteLine('nNum is not 1 nor 2'); break; }

495. Which of the following is a valid C# statement?

496. Which of the following is the correct output for the C# code snippet? String s1 = 'UpWork'; String s2; s2 = s1.Insert(4, 'Project'); Console.WriteLine(s2);

497. Which of the following statements is false in relation to following method? static byte[] GetBytes(string str) { byte[] bytes = new byte[str.Length * sizeof(char)]; System.Buffer.BlockCopy(str.ToCharArray(), 0, bytes, 0, bytes.Length); return bytes; }

498. Four threads are working simultanmeously on an ArrayList object. How many enumerators will exit in this case?

499. How can you code to display 'This is XAML' in XAML?

500. Which of the following are ways of ensuring that a user enters an integer value in a WinForms application?

501. Which of the following is the correct way to calculate 'Age' from date of birth? Example : DateTime bday= DateTime((1990, 10, 3));

502. Which of the following statements are true about the following C#.Net code? String s1, s2; s1 = 'UpWork'; s2 = 'UpWork';

503. Which of the following code snippets returns the type of T, based on the code below? List< T > myList = new List< T >;

504. What will be the output of the following Main program in a C# console application (Assume required namespaces are included): static void Main(string[] args) { string s = null + true; Console.WriteLine(s); Console.ReadLine(); }

505. What will be the output of the following Main program in a C# console application (Assume required namespaces are included): static void Main(string[] args) { Guid g = new Guid('iamnotguid'); Console.WriteLine(g); Console.ReadLine(); }

506. Which of the following statements is correct about implementing interfaces explicitly? interface I1 { void example(); }

507. Which of the following operators cannot be overloaded?

508. Which of the following is the correct way to call the function Jobs(int i) of the UpWork class given below? class UpWork { public int Jobs(int i) { Console.Writeline('UpWork!'); return 0; } }

509. Consider the following code output? static void Main(string[] args){ int i, j = 1, k; for (i = 0; i < 3; i++) { k = j++ - ++j; Console.Write(k + ' '); } }

510. In Constructor overloading, n number of __ can be created for the same class?

511. What is the output when following code is executed? using System; using StringBuilder; namespace Text { class Program { public static void Main(string[] args) { StringBuilder sb = new StringBuilder('hello world in c#'); sb.Insert(4, 'example'); Console.WriteLine(sb); Console.ReadLine(); } } }

512. What is the output when following statement is executed? static void Main(string[] args){ int i = 1, j; do { for (j = 1; ; j++) { if (i == j) continue; Console.WriteLine(i + ' ' + j); } i++; } while (i < 3); Console.ReadLine(); }

513. What will be the output of the given code snippet below? static void Main(string[] args) { int i = 15 ; for( ; ; ) { Console.Write(i + ' '); if (i >= -10) i -= 3; else break; } }

514. Consider the following C# code, What output will be printed on the console? enum Color: int { Blue, Red, Green, Yellow, Orange } int color = (int)Color.Green; Console.WriteLine('{0} and {1}', color, Color.Yellow);

515. Which of the following are correct in relation to the above C#.Net code? Stack st = new Stack(); st.Push('UpWork'); st.Push(9.2); st.Push(6); st.Push('i'); st.Push(false);

516. Which of the following is not true about interfaces in C#?

517. Suppose a HashTable named 'upwork' maintains a collection of project areas and the name of the best freelancer in each area. Which of the following is the correct way to find out whether the project area 'C# programming' is present in the collection or not?

518. Which statement below is correct? 

519. Which of the following exceptions cannot be thrown by the Delete() method of the FileInfo class? 

520. Number of threads that exists for each of the processes that occurs in the program?

521. Which of the following keyword you can used for correct implementation of an interface in C#.NET?

522. What is OCP?

523. How can we use COM components in .Net?

524. Correct way to define a value 6.28 in a variable ‘a’ where value cannot be modified ? (Choose all that apply)

525. Which construct is used to do a left outer join in LINQ?

526. Which statement(s) is/are correct?

527. What does the given code snippet specify? public Thread(ThreadStart start) = = = = = a) Initialization of a new instance of the Thread class. b) Declaration of a thread constructor.

528. In C#, an interface cannot contain which signature?

529. To implement delegates, the necessary condition is?

530. Which of the following are true? 1) Int32.Parse() can only convert strings. 2) Convert.ToInt32() can take any class that implements IConvertible , and returns 0 when the argument is null.

531. Which of the following C# code snippets correctly copies the contents of one string into another?

532. Strings built using the String class are immutable, whereas those built using the StringBuilder class are mutable?

533. Which of the following best describes the correct usage of exception handling over conventional error handling approaches? a) Errors can be ignored but exceptions cannot be ignored. b) Exception handling allows separation of the program’s logic from the error handling logic, making software more reliable and maintainable. c) try – catch – finally structure allows guaranteed clean up in event of errors under all circumstances.

534. Choose the incorrect statement about delegates?

535. What is output for the following set of Code? static void Main(string[] args) { String obj = 'hello'; String obj1 = 'world'; String obj2 = obj; string s = obj+' '+obj1; Console.WriteLine(s.IndexOf(r)); Console.ReadLine(); }

536. Which of the following stream class method you can use for the close connection?

537. How you can display different data at run time and design time?

538. Which of the following is the object oriented way to handle run time errors? (Choose all that apply)

539. Which of the following statements is correct about the difference between Static readonly and const?

540. If 's1' and 's2' are references to two strings, then which of the following is the correct way to compare the two references?

541. What will be the output of the following set of code? { int sum = 10; try { int i; for (i = -1; i < 3; ++i) sum = (sum / i); } catch (ArithmeticException e) { Console.WriteLine('0'); } Console.WriteLine(sum); Console.ReadLine(); }

542. What is the purpose of the yield keyword in C#?

543. Which of the following code snippets are the correct way to convert a Single into a String in C#? (Choose all that apply.)

544. Which of the following statements are correct?

545. What is the fundamental difference between double and decimal variable types?

546. When should the 'as' keyword be used in C# ?

547. Which of the following will return the absolute URL (ie. http://www.something.com/index.aspx) of the requested page (ASP.NET)?

548. Which statement(s) is/are incorrect in relation to the two functions below? 1. public static byte[] ReadFully(Stream input) { byte[] buffer = new byte[16*1024]; using (MemoryStream ms = new MemoryStream()) { int read; while ((read = input.Read(buffer, 0, buffer.Length)) > 0) { ms.Write(buffer, 0, read); } return ms.ToArray(); } } 2. public static byte[] ReadFully(Stream input) { using (MemoryStream ms = new MemoryStream()) { input.CopyTo(ms); return ms.ToArray(); } }

549. Which of the following can be used to expose a method as a field to the outside world?

550. Which of the following statements is incorrect regarding the Dictionary and Hashtable data types in the .NET Framework?

551. Which of the following statements are true about Struct in C#?

552. How is Math.Pow() implemented in the .NET Framework?

553. What is the best way to copy the contents of one stream to another in .NET 4?

554. Select the result of the given code snippet: class Program { static void Main(string[] args) { int[] nums = { 16, 9, 25}; var posNums = from n in nums where n > 0 select Math.Sqrt(n); Console.Write('The positive values in nums: '); foreach (int i in posNums) Console.Write(i + ' '); Console.WriteLine(); Console.ReadLine(); } }

555. What will be the output of given code snippet? class Program { static void Main(string[] args) { int[] nums = { 1, -2, 3, 0, -4, 5}; var posNums = from n in nums where n >= 0 select n; foreach (int i in posNums) Console.Write(i + ' '); Console.WriteLine(); Console.ReadLine(); } }

556. What would be the output of following code snippet? { try { int a, b; b = 0; a = 10 / b; Console.WriteLine('A'); } catch(ArithmeticException e) { Console.WriteLine('B'); } Console.ReadLine(); }

557. What is the following code correct output for the C# code snippet shown below? String s1 = 'UpWork Skills Test'; String s2; s2 = s1.Substring(12, 3); Console.WriteLine(s2);

558. What is the output of the following code? class Test { static void Main() { string s = @'Joe said\t ' 'Hello'' to me!'; System.Console.WriteLine(s); } }

559. What will be the output of the following Main program in a C# console application (Assume required namespaces are included)? private static void TestSwitch(int iValue) { switch (iValue) { case 1: case 2: case 3: case 4: Console.WriteLine(I am less than 5.); break; case 6: case 7: case 8: Console.WriteLine('I am greater than 5.'); break; default: Console.WriteLine('I handle rest.'); break; } } static void Main(string[] args) { TestSwitch(2); TestSwitch(8); TestSwitch(5); Console.ReadLine(); }

560. Which of the following is not a valid .NET Framework Attribute?

561. Which of the following is a correct way to convert a String to an int in C#?

562. What does the following code block define? Check all that apply. class Gen { T ob; }

563. Which of the following statements is true about the System.Environment.NewLine property?

564. Which of the following is not a keyword in C#?

565. How can extension methods be added to an existing static class?

566. Which of the following code samples will read an integer from a byte[]?

567. DataContext class acts as a bridge between SQL Server database and the _____ to SQL?

568. Consider the following delegate declaration,Which of the following are TRUE? delegate void del(int i);

569. Which of the following statements about deleagtes are UNTRUE?

570. Which of the following statements are correct about delegates?

571. Which of the following how you can use retrieve a single row with LINQ?

572. Which of the following right syntax for declaration and initialization of data variable?

573. What are the types of children does object element can have in XAML?

574. Recursion is a process of defining a ___ that calls itself repeatedly in C#?

575. Choose the correct statement about System.Type namespace?

576. What is the difference between 'throw ex' and 'throw' in C#?

577. Which of the following types of LINQ?

578. Which of the following is the correct syntax to group query results using LINQ?

579. Choose the namespace in which Expression trees are encapsulated?

580. Which of the following keywords must be used to monitor exceptions handling?

581. C# has support for strongly-typed function pointers via the keyword?

582. A class consists of two __ with each interface consisting of __ , __ and class had no instance data?

583. Structures can have methods, , , _____, operator methods, and events?

584. What kind of exception is being thrown if Wait(),Pulse() or PulseAll() iscalled from code that is not within synchronized code?

585. Which of the following is an ordered collection class? (choose all that apply)

586. Which among the following is the ordered collection class? (Check all that apply)

587. What is the output if following code executed? static void Main(string[] args){ String obj = 'sample'; String obj1 = 'program'; String obj2 = obj; Console.WriteLine(obj + ' ' + obj1); string s = obj + ' ' + obj1; Console.WriteLine(s.Length); Console.ReadLine(); }

588. Which of the following properties related to network errors is generated by WebException?

589. What is the difference between const and readonly?

590. Which statement is correct about the C#.NET code snippet given below? Stack st = new Stack(); st.Push('Csharp'); st.Push(7.3); st.Push(8); st.Push('b'); st.Push(true);

591. The expression of a lock statement must denote a value of a type known to be a?

592. Identifier is a name which can be used to identify a __, __, __?

593. Which is the correct way to enumerate an Enum in C#?

594. Which of the following statements are correct about a HashTable collection? (Choose all that apply)

595. A generic type with arguments provided, like KeyValuePair, is called?

596. What is Semaphore?

597. Which of the following keywords is used to manually throw an exception handling?

598. Which of the following constitute the .Net framework?

599. Among the given collections which one is I/O index based? (Check all that apply)

600. Among the given collections which one is I/O index based? (Choose all that apply).

601. Consider an ArrayList collection that implements the IEnumerable interface. Which of the following statements are true?

602. Which of the following statements is true about the .Net framework and DCOM?

603. How many Bytes are stored by ‘Long’ Datatype in C# .net?

604. What is the problem with the following function? (The code is supposed to convert a Stream into byte array) public static byte[] ReadFully(Stream input) { using (MemoryStream ms = new MemoryStream()) { input.CopyTo(ms); return ms.ToArray(); } }

605.

Which feature allows you to obtain information about the use and capabilities of types at runtime? 

606. In C#.NET, if we do not catch the exception thrown at runtime then which of the following will catch it? 

607. The ‘ref’ keyword can be used as: (Check all that apply)

608. Assume 2 columns are named Product and Category. How can they be sorted based on first by category and then by product name?

609. Select the error in the given program : public static void Main() { const int m = 100; int n = 10; const int k = n / 5 * 100 * n ; Console.WriteLine(m * k); Console.ReadLine(); }

610. Which operator is used to access member function of a class?

611. Which of the following is not an interface declared in System.Collection namespace? 

612. Which datatype should be used for storing a simple number like 35 to improve execution speed of a program?

613. Verbatim string literal is better used for ?

614. Which of the following is NOT a .NET Exception class?

615. Which String method is used to compare two strings?

616. Which statement is correct about an Exception? 

617. Choose the advantages of using generics? 

618. Which of the following interfaces are declared in the System.Collections namespace? (Choose all that apply)

619. Select the type argument of an open constructed type.

620. Where should auto implemented properties be initialized to a Default value? 

621. Which of the following predefined attributes in C# ?

622. Consider the following code: class Program { static void Main(string[] args) { float f = double d = decimal dc = 0; PrintDouble(f); // Statement 1 PrintDouble(d); // Statement 2 PrintDouble(dc); // Statement 3 } static private void PrintDouble(double d) { Console.WriteLine(d.ToString()); } } Which of the following are true?

623. Which of the following is the correct way to convert a Byte Array to a Hexadecimal String, and vice versa?

624. What would be the output of following code snippet? Namespace Outer { Using System; Class Math { } } Namespace Outer.Inner { Class Foo { Public static double Bar() { Return Math.PI; } } Class program { Public static void Main() { Console.WriteLine('Value of PI is; ' + Foo.Bar() .ToString()); } } }

625. What is true about a sealed class in C#?

626. Which of the following is the correct way to call method Jobs() of the UpWork class given below? class UpWork { public void Jobs(inti, Single j) { Console.Writeline(UpWork); } }

627. Choose the namespace in which the interface IEnumerable is declared?

628. Which is the correct way to find out the number of elements currently present in an ArrayListCollection called arr?

629. What is the purpose of the Open XML SDK 2.0?

630. Choose the method defined by MemberInfo:

631. Which of the following are jobs not performed by the Garbage Collector? 1. Freeing stack memory. 2. Avoiding memory leakage. 3. Freeing memory occupied by unreferenced objects. 4. Closing unclosed database collections. 5. Closing unclosed files.

632. Choose the class from which the namespace ‘System.Type’ is derived:

633. Choose the incorrect statement among the following about the delegate?

634. Which statement about a String is correct?

635. Disadvantages of Explicit Conversion are ? (Choose all that apply)

636. Which of the following are not ordered collection classes? (choose all that apply)

637. Which of the following statements is false about virtual and abstract methods?

638. What is the default type of a number without a decimal in C#?

639. Which of the following benefits do we get on running managed code under CLR? 1. Type safety of the code running under CLR is assured. 2. It is ensured that an application would not access the memory that it is not authorized to access. 3. It launches separate process for every application running under it. 4. The resources are Garbage collected.

640. At what times can a readonly field of a class be initialized? (Choose all that apply)

641. What is the output of the following code? static void Main(string[] args) { int a = 5; if (Convert.ToBoolean((.002f) -(0.1f))) Console.WriteLine('Hello'); else if (a == 5) Console.WriteLine('World'); else Console.WriteLine('Bye'); Console.ReadLine(); }

642. Consider the following C# code. What would be the value of d? int? a = 10; int? b = 11; int? c = 12; a = null; int? d = a ?? b ?? c;

643. Which of the following components of the .Net framework provide an extensible set of classes that can be used by any .Net compliant programming language?

644. A generic class is defined ____ on the class definition line.

645. An example of a floating point data type is ____.

646. If you do not provide an access specifier for a class field, its access is ____ by default.

647. In c#, parameters can be mandatory or ____.

648. Object attributes are often called ____ to help distinguish them from other variables you might use

649. Predefined types such as int, double, and char are ____ types.

650. you can use the ____ method to accept user input from the keyboard.

651. The ____ control allows you to retrieve date information.

652. The starting point of a c# program is the _____ method.

653. A string variable can be declared as an array with elements that are of __________ type.

654. The ____ class access modifier means that access to the class is not limited.

655. A method’s name and a list of argument types together are its ____.

656. A variable that holds the accumulated result of a sum is called a(n) __________.

657. A(n) ____ is another name for a subscript.

658. The ____ class provides the definitions for gui objects.

659. An array is a(n) ____ of values in computer memory.

660. A(n) ____ constructor will never take any parameters.

661. A(n) ____ is associated with every running program.

662. In which of these situations are interfaces better than abstract classes?

663. Which statement is true of delegates?

664. Which choice best defines C#'s asynchronous programming model?

665. What is the difference between the ref and out keywords?

666. How could you retrieve information about a class, as well as create an instance at runtime?

667. What is the difference between an anonymous type and a regular data type?

668. When would you use a Dictionary rather that an Array type in your application?

669. What is the difference between a.Equals(b) and a == b?

670. Which choice best describes a deadlock situation?

671. How does the async keyword work?

672. What is an object in C#?

673. Which code snippet declares an anonymous type named userData?

674. What will be returned when this method is executed? public void userInput(string charParamters) { }

675. Lambda expressions are often used in tandem with which of the following?

676. What is the correct formatting for single line and multiline comments?

677. How do you make a method in an abstract class overridable?

678. How would you write code for an integer property called Age with a getter and setter?

679. What is an abstract class?

680. When using a thread pool what happens to a given thread after it finishes its task?

681. Which choice represents a class that inherits behavior from a base class?

682. What does operator overloading allow you to do?

683. What it the main purpose of LINQ?

684. What is the correct syntax for a new generic list of strings named contacts?

685. What is the difference between throw exceptions and throw clauses?

686. When an asynchronous method is executed, the code runs but nothing happens other than a compiler warning. What is most likely causing the method to not return anything?

687. What are C# events?

688. What kind of values can arrays store?

689. Given this enumeration, how would you access the integer-type value of 'AppState.Loading'? enum AppState { OffLine, Loading, Ready }

690. What character would you use to start a regular expression pattern at a word boundary?

691. You're dealing with multiple assemblies in your program, but are worried about memory allocation. At what point in the program life cycle are assemblies loaded into memory?

692. What is most accurate description of a regular expression?

693. Why would you use a class field in C#

694. When would you use generics in your code?

695. How would you declare a sealed class named User?

696. What is the correct syntax for a new generic list of strings named contacts? (similar to Q26)

697. What is the difference between non-static and static classes?

698. Which characteristic prevents this code from compiling? public int age="28"

699. How would you serialize this class? public class User {}

700. How would you write a delegate named ResultCallback with an int parameter named responseCode?

701. What is the difference between a static and non-static method?

702. What is the correct way to write an event named apiResult based on a delegate named ResultCallback?

703. When will the code inside finally block be executed in a try-catch statement?

704. What method correctly extends the string class?

705. How are C# classses limited?

706. What function do namespaces perform?

707. What is a thread pool?

708. What is the most accurate description of a regular expression?

709. When an object in C# is serialized, what is it converted to?

710. What is a delegate

711. What are the four keywords associated with exception handling in C#?

712. What is the main difference between the is and as operators?

713. What is the difference between finally and finalize blocks?

714. Your application has a value type called username that needs to be able to accept null values, but this is generating compile-time errors. How would you fix this in code?

715. Which code snippet correctly declares a custom exception named InvalidResponse?

716. How would you write an enum variable called AppState with values for Offline, Loading, and Ready?

717. What is the main difference between a value type and a reference type?

718. What is the difference between the break and continue keywords?

719. Which code snippet correctly declares a variable named userId with a public get and private set?

720. What is true about virtual methods?

721. How do you indicate that a string might be null?

722. Do you need to declare an out variable before you use it?

723. How would you access the last two people in an array named People?

724. When can anonymous types be created?

725. What is true about thread multitasking?

726. A(n) ____ is client software that displays web page elements and handles links between pages.

727. When you copy data from a file on a storage device into ram, you are ____ from the file.