8 WRITE A PROGRAM TO DEMONSTRATE ABSTRACT CLASS AND ABSTRACT METHODS IN C#.

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
namespace Lab8
 {
abstract class person
  {
protected string fname;
protected string lname;
public person(string fn, string ln)
{
fname = fn;
lname = ln;
}
public abstract void display() ;
}

class emp : person
{
public ushort year;
public emp(string fn, string ln, ushort yr): base(fn, ln)
{
year = yr;
}
public override void display()
  {
Console.WriteLine("Employee :" + fname + " " + lname + " " + year);
}
}
class worker : person
 {
    public String company;
             public worker(string fn, string ln, string c) : base(fn, ln)
{
company = c;   
}   
public override void display() { 
Console.WriteLine("Worker :" + fname + " " + lname + " " + company); 
}   
}   
class Program   
{   
         static void Main(string[] args) 
{
Console.WriteLine("**ABSTRACT CLASS  AND ABSTRACT METHODS DEMO **"); 
person p2 = new emp("RAM", "KUMAR", 2012); 
person p3 = new worker("RAM", "KUMAR", "ABC TECH SOLS"); 
p2.display();   
p3.display();   
Console.ReadLine();   
}   
}   
}