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

 

 

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?

Which statement below is correct? 

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

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

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

Can multiple catch blocks be executed?

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(); } }

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

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

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