using System;

public class Program

{

    public static void Main()

    {

        parent p = new child();

        p.show();

    }

}

​

class parent

{

    public virtual void show()

    {

        Console.Write("This is parent class");      

    }           

}

​

class child : parent 

{

    public override void show()

    {

        Console.Write("This is in child class");

    }

}

​

class child_2 : parent

{

    public override void show()

    {

        Console.Write("This is in child 2");

    }

}