oops concept in c#

Object Oriented Programming language(OOPS):
 It is a methodology to write the program where we specify the code in form of classes and objects.

Basic Principle of oops:- There are main four core principles of  any object oriented languages.
1.Abstraction
2.Encapsulation
3.inheritance

4.polymorphisim

Note: If any programing languge supports abave give 4 support is called oops

1.Abstraction :

Hidding the implementation details and Exposing the required details of the user.

Types:

  a.Data abstraction or data hidding

 b.Behaviour abstraction or impliment hidding

2.Encapsulation:

It is nothing but binding the related variables and behaviour in a common place

-> Better mantainability is the primery advantage .

3.inheritance:

By using inheritance we can achive code resability 

->Better mantenability

->Avoid duplication

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";

   }

}

4.polymorphisim:

{ all the details for this one another post}