inheritance in c#

inheritance:

By using inheritance we can achive code reusability 

->Better mantenability

->Avoid duplication
-> Multiple inheritance not applicable in inheritance(for avoiding this we  are use interfaces)

Types:

1.single

2.multiple

3.multilevel

4.hybrid

 sample code:

public class test

{

protected void page_load(-,)

{

  B b=new B();

   b.m();    // without create object we can access methods and variable(only possable inheritance)

  b.m1();

public class A

 {

  public int x=20;

 public int m()

    {

      return 200;

   }

public class B:A

  {

    public int y=30;

   public string m1()

    {

      return "mother";

   }

}

Q).why multiple inheritance of classes in not supported in C#?

ans:

There is no definitive answer to this question. It is a matter of taste.
There is the classic diamond problem encountered in multiple inheritance, in which class D inherits from both B and C, which both inherit from A.

  A
 / \
B   C
 \ /
  D

So which copy of A does D get? The one from B, the one from C? Both? This way various languages resolve this problems is discussed here: