using System;

​

 public  class Program

    {

        public static void Main(string[] args)

        {

            Emp[] e=new Emp[4];

            e[0]=new Emp();

            e[1]=new FullTimeEmp();

            e[2]=new PartTimeEmp();

            e[3]=new TempEmp();

            foreach(Emp k in e)

            {

                k.PrintFullName();

            }

        }

​

    }

​

​

​

    public class Emp//base class or parent class

    {

        //common code

       public  string firstname="fn";

       public  string lastname="sn";

      // public  string email;

​

        public virtual void PrintFullName()

        {

            Console.WriteLine(firstname + lastname);

           //Console.ReadLine();

​

        }

​

    }

​

    //sub class or child class or derived class

    public class FullTimeEmp:Emp

    {

          public override void PrintFullName()

        {

            Console.WriteLine(firstname + lastname+"_fullTIme");

           //Console.ReadLine();

​

        }

    }

​

    public class PartTimeEmp:Emp

    {

         public override void PrintFullName()

        {

            Console.WriteLine(firstname + lastname+"_partTime");

           //Console.ReadLine();

​

        }

    }

    public class TempEmp:Emp

    {

          public override void PrintFullName()

        {

            Console.WriteLine(firstname + lastname+"_Temp");

           //Console.ReadLine();

​

        }

    }

​

​

​

​