static void Main(string[] args)
        {
            Console.WriteLine(" This is Tracy's Assignment_3.  ");

            FirmRestaurant.Demo();
            FirmSalon.Demo();

            Console.WriteLine("\n\t That is all!");
        }
        public static void Demo()
        {
            Console.WriteLine("\n\t This is the list of salons. ");
            FirmSalon firmSalon = new FirmSalon();

            firmSalon.AddSalon(new Salon("Beauty", "Korean Town", "Hair", 20));
            firmSalon.AddSalon(new Salon("Zoen", "Malden", "Body", 40));
            firmSalon.AddSalon(new Salon("Tony", "Watertown", "Nail", 60));
            firmSalon.AddSalon(new Salon("World", "backbay", "Hair", 30));
            firmSalon.AddSalon(new Salon("Miss.Ann", "downtown", "Body", 80));

            firmSalon.ShowSalonTable();
            firmSalon.SortSalonTable();
            Console.WriteLine("\n\t This is the result after the sorting.");
            firmSalon.ShowSalonTable();
        }