using System;

​

public class emplyoee{

    public string fn="xyz";

        public  string ln="abc";

    public virtual void display(){                      //virtual means-any derived class can override these method.

        Console.WriteLine("first name and last name :{0}",fn+ " " +ln);

    }

}

public class parttimeempplyoee:emplyoee{

    public override  void display(){

        Console.WriteLine("first name and last name :{0}",fn+ " " +ln+ " "+"-part-time");

    }

}

public class fulltimeempplyoee:emplyoee{

    public override  void display(){

        Console.WriteLine("first name and last name :{0}",fn+ " " +ln+ " "+"-full-time");

    }

}

public class temprorytimeempplyoee:emplyoee{

    public  override void display(){

        Console.WriteLine("first name and last name :{0}",fn+ " " +ln+ " "+"-temprory-time");

    }

}

​

​

​

​

public class program{

    public static void  Main(string[] args){

        emplyoee[] e = new emplyoee[4];

        e[0]= new emplyoee();

        e[1]=new parttimeempplyoee();

        e[2]=new fulltimeempplyoee();

        e[3]=new temprorytimeempplyoee();

        foreach(emplyoee emp in e){

            emp.display();

        }

        //parttimeempplyoee pt=new parttimeempplyoee();

        //pt.display();

    }

}

​

//polymorphism allows to  invoke the derived class methods using a base class refrence at run time. so in base class we declared a method with virtul keyword and in derived class we can override that metthod.