using System;

/*

    Polymorphism is a Greek word, meaning "one name many forms". In other words, one object has many forms or has one name with multiple functionalities. 

    "Poly" means many and "morph" means forms. Polymorphism provides the ability to a class to have multiple implementations with the same name. 

    Object behaves differently in different-different situation. It is one of the core principles of Object Oriented Programming after encapsulation and inheritance.

    There are two types of polymorphism in C#: compile time polymorphism and runtime polymorphism. Compile time polymorphism is achieved by method overloading and 

    operator overloading in C#. It is also known as static binding or early binding. Runtime polymorphism in achieved by method overriding which is also known as 

    dynamic binding or late binding.

*/

// C# Runtime Polymorphism Example

public class Shape

{

    public virtual void draw()

    {

        Console.WriteLine("Drawing...");

    }

}

​

public class Rectangle: Shape

{

    public override void draw()

    {

        Console.WriteLine("Drawing Rectangle...");

    }

}

​

public class Circle : Shape

{

    public override void draw()

    {

        Console.WriteLine("Drawing Circle...");

    }

}

​

public class Program

{

    public static void Main()

    {

        Shape s;

        s = new Shape();

        s.draw();

        s = new Rectangle();

        s.draw();

        s = new Circle();

        s.draw();

    }

}