Usage of Operator Overloading in C#
By Prasad H.

Here is simple and easy example of operator overloading.

using System;

class Rectangle
{
  private int iHeight;
  private int iWidth;

  public Rectangle()
  {
    Height=0;
    Width=0;
  }
  public Rectangle(int w,int h)
  {
    Width=w;
    Height=h;
  }

  public int Width
  {
    get
    {
      return iWidth;
    }
    set
    {
      iWidth=value;
    }
  }
  public int Height
  {
    get
    {
      return iHeight;
    }
    set
    {
      iHeight=value;
    }
  }

  public int Area    
  {
    get
    {
      return Height*Width;
    }
  }

  /* OverLoading ==  */

  public static bool operator==(Rectangle a,Rectangle b)
  {
    return ((a.Height==b.Height)&&(a.Width==b.Width));
  }

  /* OverLoading != */

  public static bool operator!=(Rectangle a,Rectangle b)
  {
    return !(a==b);
  }

  /* Overloding > */

  public static bool operator>(Rectangle a,Rectangle b)
  {
    return a.Area>b.Area;
  }

  /* Overloading < */
  public static bool operator < (Rectangle a,Rectangle b)
  {
    return !(a > b);
  }

  /* Overloading >= */

  public static bool operator >= (Rectangle a,Rectangle b)
  {
    return (a>b)||(a==b);
  }

  /* Overloading <= */

  public static bool operator <= (Rectangle a,Rectangle b)
  {
    return (a < b)||(a==b);
  }

  public override String ToString()
  {
    return "Height=" + Height + ",Width=" + Width;
  }
  public static void Main()
  {
    Rectangle objRect1 =new Rectangle();
    Rectangle objRect2 =new Rectangle();
    Rectangle objRect3 =new Rectangle(10,15);
    objRect1.Height=15;
    objRect1.Width=10;
    objRect2.Height=25;
    objRect2.Width=10;
    Console.WriteLine("Rectangle#1 " + objRect1);
    Console.WriteLine("Rectangle#2 " + objRect2);
    Console.WriteLine("Rectangle#3 " + objRect3);

    if(objRect1==objRect2)
    {
      Console.WriteLine("Rectangle1 & Rectangle2 are Equal.");
    }
    else
    {
      if(objRect1 > objRect2)
      {
        Console.WriteLine("Rectangle1 is greater than Rectangle2");
      }
      else
      {
        Console.WriteLine("Rectangle1 is lesser than Rectangle2");        
      }
    }

    if(objRect1==objRect3)
    {
      Console.WriteLine("Rectangle1 & Rectangle3 are Equal.");
    }
    else
    {
      Console.WriteLine("Rectangle1 & Rectangle3 are not Equal.");
    }
  }
}


Output:
=======
Rectangle#1 Height=15,Width=10
Rectangle#2 Height=25,Width=10
Rectangle#3 Height=15,Width=10
Rectangle1 is lesser than Rectangle2
Rectangle1 & Rectangle3 are Equal.