using System;

​

public class Program

{

    class Student // this is a super class

    {

        protected string name; //rotected members can be used by methods in both super and sub classes

        public void setName(string n)

        {

            name = n;

        }

    }

​

    class OlStudent : Student // this is a sub class which re-uses members in super class

    {

        public void show()

        {

            Console.WriteLine(name);

        }

    }

​

    public static void Main()

    {

        OlStudent x = new OlStudent();

        x.setName("Jason");

    }

}