public void SelectCampground_ReservationByCampground()
        {
            bool   done  = false;
            string input = "";

            while (!done)
            {
                Console.WriteLine("Which campground (enter 0 to cancel)?");
                input = Console.ReadLine();
                Console.WriteLine();

                switch (input)
                {
                case "0":
                    Console.Clear();
                    DisplayCampgrounds();
                    CampgroundReservationMenu();
                    break;

                default:
                    done = helper.CampgroundFilterMenuCamp(input, campgroundNames.Count);
                    break;
                }

                selectedCampgroundId = (done) ? campgrounds[Convert.ToInt32(input) - 1].Id : selectedCampgroundId;
            }
        }