static void Main(string[] args)
{
Shipper customer = new Shipper();
Driver ID = new Driver();
Console.WriteLine("Enter the user type");
Console.WriteLine("customer");
Console.WriteLine("driver");
user_Id = Console.ReadLine();
if (user_Id == "customer")
{
customer.Login();
customer.Place_order();
}
else if (user_Id == "driver")
{
ID.Login();
ID.Accept_order();
}
Console.ReadKey();
}