Runtime polymorphism

Bellow Article Explain how you can achieve Run-time Polymorphism

 using System;  
 using System.Collections.Generic;  
 using System.Linq;  
 using System.Text;  
 namespace Runtime_polymorphism  
 {  
   class Program  
   {  
     static void Main(string[] args)  
     {  
       /* Testing Polymorphism */  
       Shape[] s = new Shape[3];  
       /* Polymorphic Objects */  
       /* creating Array with Different types of Objects */  
       s[0] = new Circle();  
       s[1] = new Ractangel();  
       s[2] = new Traingle();  
       Console.WriteLine("\n\nRuntime polymorphism test\n\n");  
       for (int i = 0; i < 3; i++)  
       {  
         s[i].Draw();  
       }  
       Console.ReadKey();  
     }  
   }  
 -------------------------------------------------------------------------------------------------------------  
   class Shape  
   {  
     public virtual void Draw()  
     {  
     }  
   }  
 -------------------------------------------------------------------------------------------------------------  
   class Ractangel : Shape  
   {  
     public override void Draw()  
     {  
       Console.WriteLine("Rectangle Drawn ");  
     }  
   }  
 --------------------------------------------------------------------------------------------------------------  
   class Circle : Shape  
   {  
     public override void Draw()  
     {  
       Console.WriteLine("Circle Drawn ");  
     }  
   }  
 -------------------------------------------------------------------------------------------------------------  
   class Traingle : Shape  
   {  
     public override void Draw()  
     {  
       Console.WriteLine("Triangle Drawn ");  
     }  
   }  
 }