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

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.

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

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

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

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

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

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

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:

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

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