using System;

​

public abstract class Customer

{

    public abstract void Print();

}

public class Program : Customer

{

    public override void Print()

    {

        Console.WriteLine("Print Method");

    }

    public static void Main()

    {

        //Program P = new Program();

        //P.Print();

        //Calling sbrtract methods using abstract class reference variable 

        //pointing to the derived class object

        Customer C = new Program();

        C.Print();

    }

}