Inheritance in C# Programming

Classes can inherit from another class. This is accomplished by putting a colon after the class name when declaring the class, and naming the class to inherit from—the base class—after the colon, as follows:

public class Point
{

  //----class properties------//
  private int x{set;get;}
  private int y{set;get;}
  
  //----default constructor----//
  public Point(){
  }
  //custom constructor  
  public Point(int a,int b){
    this.x=a;
    this.y=b;
   }
 
  //----class methods-----//
  public void getX(){
      return this.x;
  }

  public void getY(){
     return this.y;
   }

  public int setX(int a){
     this.x=a;
  }

  public int setY(int b){
     this.y=b;
  }

  
}

//Line  class is Inherited from Point class here
public class Line : Point 
{
    private Point p1{set;get;}
    private Point p2{set;get;}

   public Point(){

   }

    public Point(Point a,Point b){
       this.p1=a;
       this.p2=b;
   }

   ...
      
}

The new class—the derived class—then gains all the non-private data and behavior of the base class in addition to any other data or behaviors it defines for itself. The new class then has two effective types: the type of the new class and the type of the class it inherits.