static void Main(string[] args) { OrderService os = new OrderService(); os.AddOrder(1, "LeoZB", "Leona"); os.AddOrder(2, "JohnnyZB", "wotslb"); os.RemoveOrder(2, "JohnnyZB", "wotslb"); os.AmendOrder(1, "LeoZB", "Leona", 2, "JohnnyZB", "wotslb"); os.InquireByCustomer("wotslb"); os.InquireByNum(1); os.InquireByName("JohnnyZB"); }