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Microsoft .NET Interview Questions and Answers

Test your skills through the online practice test: Microsoft .NET Quiz Online Practice Test

Freshers / Beginner level questions & answers

Ques 1. Name 10 C# keywords.

abstract, event, new, struct, explicit, null, base, extern, object, this

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Ques 2. What is public accessibility?

There are no access restrictions. All can access the public instance from anywhere.

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Ques 3. What is private accessibility?

Access is restricted to within the containing class.

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Ques 4. Class methods to should be marked with what keyword?

Static.

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Ques 5. Does an object need to be made to run main?

No

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Ques 6. Write a hello world console application.

using System;
namespace Console1
{
class Class1
{
[STAThread] // No longer needed
static void Main(string[] args)
{
Console.WriteLine("Hello world");
}
}
}

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Ques 7. What is recursion?

Recursion is when a method calls itself.

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Ques 8. What is a constructor?

A constructor performs initialisation for an object (including the struct type) or class.

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Ques 9. What is a destructor?

A C# destuctor is not like a C++ destructor. It is actually an override for Finalize(). This
is called when the garbage collector discovers that the object is unreachable. Finalize()
is called before any memory is reclaimed.

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Ques 10. Name 5 built in types.

Bool, char, int, byte, double

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Ques 11. Is string Unicode, ASCII, or something else?

Unicode

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Ques 12. Strings are immutable, what does this mean?

Any changes to that string are in fact copies.

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Ques 13. Name a few string properties.

trim, tolower, toupper, concat, copy, insert, equals, compare.

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Ques 14. What is boxing and unboxing?

Converting a value type (stack->heap) to a reference type (heap->stack), and viseversa.

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Ques 15. Write some code to box and unbox a value type.

// Boxing
int i = 4;
object o = i;
// Unboxing
i = (int) o;

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Ques 16. What is a heap and a stack?

There are 2 kinds of heap 1: a chunk of memory where data is stored and 2: a tree
based data structure. When we talk about the heap and the stack we mean the first kind
of heap. The stack is a LIFO data structure that stores variables and flow control
information. Typically each thread will have its own stack.

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Ques 17. What is a pointer?

A pointer is a reference to a memory address.

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Ques 18. What does new do in terms of objects?

Initializes an object.

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Ques 19. What is a struct?

Unlike in C++ a struct is not a class it is a value type with certain restrictions. It is
usually best to use a struct to represent simple entities with a few variables. Like a Point
for example which contains variables x and y.

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Ques 20. Describe 5 numeric value types ranges.

sbyte -128 to 127, byte 0 255, short -32,768 to 32,767, int -2,147,483,648 to
2,147,483,647, ulong 0 to 18,446,744,073,709,551,615

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Ques 21. Write code for a case statement.

switch (n)
{
case 1:
x=1;
break;
case 2:
x=2;
break;
default:
goto case 1;
}

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