public void RunInterface()
        {
            catering.InitializeCateringItems();
            bool done = false;

            Console.WriteLine("Welcome to Cater-Mart!");
            while (!done)
            {
                Console.WriteLine("\nMAIN MENU " +
                                  "\n (1) Display Catering Items" +
                                  "\n (2) Order" +
                                  "\n (3) Quit");
                int input = int.Parse(Console.ReadLine());

                switch (input)
                {
                case 1:
                    DisplayInventory();
                    break;

                case 2:
                    OrderMenu();
                    break;

                case 3:
                    done = true;
                    break;

                default:
                    break;
                }
            }
        }