using System;

public class Program

{

    public static void Main()

    {

        //Console.WriteLine("Hello World");

        b obj = new b();

        obj.m1();

        Console.WriteLine("---------------------------------");

        a obj2;     

        obj2 = new a();

        obj2.m1();

        obj2 = new b();

        obj2.m1();

        Console.WriteLine("---------------------------------");

        a obj3 = new b();

        //obj3.m1();

        Employee E = new Employee();

            E.GetInfo();

    }

    public class a {

        public virtual void m1(){

            Console.WriteLine("parent 1");

        }   

    }

    public class b : a {

        public override void m1(){

            base.m1();

            Console.WriteLine("parent 2");

        }

    }

    public class Person

    {

        protected string ssn = "444-55-6666";

        protected string name = "John L. Malgraine";

​

        public virtual void GetInfo()

        {

            Console.WriteLine("Name: {0}", name);

            Console.WriteLine("SSN: {0}", ssn);

        }

    }

    class Employee : Person

    {

        public string id = "ABC567EFG";

        public override void GetInfo()

        {

            // Calling the base class GetInfo method:

            base.GetInfo();

            Console.WriteLine("Employee ID: {0}", id);

        }

    }

​

}