C# Interview Questions and Answers

C# programming Interview Questions

Q1. Choose the method that is used to convert a type to a byte value in C#

1. ToChar
2. ToDateTime
3. ToByte
4. ToSingle

Ans: c. ToByte

Q2. Choose the preprocessor directive that lets you generate a level 1 warning from a specific location in your C# code?

1. Region
2. Warning
3. Line
4. Error

Ans: b. Warning

Q3. Find the output of this code snippet?

class program

 {

  public static void Main(string[] args)

  {

      try

      {

          throw new NullReferenceException("C");

          Console.WriteLine("A");

      }

      catch (ArithmeticException e)

      {

          Console.WriteLine("B");

      }

      Console.ReadLine();

  }

 }

1. A
2. B
3. Runtime error
4. Compile time error

Ans: c. Runtime error

Explanation: try block throws a NullPointerException. Its arithmetic expression is countered by the catch block. However, in this case, there is no catch to counter the NullPointerExtension, so a runtime error occurs.

Q4. What is the output of the below code snippet?

static void Main(string[] args)

  {

   int i = 0, j = 0;

   l1: while (i < 2)

   { 

       i++;

       while (j < 3)

       {

              Console.WriteLine("loop\n");

           goto l1;

       }

    }

   Console.ReadLine();

  }

1. Loop
2. Loop printed infinite times
3. Loop loop
4. Compile time error

Ans: c. Loop loop

Explanation:  (i<2) executes twice. If the loop tries to execute the third time, it will not satisfy the condition (j<3), so it breaks. The output will then be loop loop.

Q5. What object size will be created by the below code?

{

class Baseclass

{

     private int i;

     protected int j;

     public int k;

}

class Derived: Baseclass

{

     private int x;

     protected int y;

     public int z;

}

class MyProgram

{

     static void Main (string[ ] args)

     {

        Derived d = new Derived();

     }

}

}

1. 12 bytes
2. 20 bytes
3. 24 bytes
4. 10 bytes

Ans: c. 24 bytes

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