static void Main(string[] args)
{
Console.WriteLine("Please understand the Type Forwarding Concept");
Clerk objClerk = new Clerk();
Manager objManager = new Manager();
HouseKeeping objHouseKeeping = new HouseKeeping();
objClerk.DisplayClerk();
objManager.Display();
objHouseKeeping.DisplayHouseKeeping();
Employee.Display();
Console.ReadLine();
}