public void BookingRoomAdd(RoomClass roomClass, RoomTypex roomType) { BookingRoom bookingRoom = new BookingRoom() { RoomClass = roomClass, RoomType = roomType, Book = Booking }; Customer customer1 = new Customer() { Type = CustomerType.Adult, BookingRooms = new List <BookingRoom>(), }; customer1.BookingRooms.Add(bookingRoom); Customer customer2 = new Customer() { Type = CustomerType.Adult, BookingRooms = new List <BookingRoom>(), }; customer2.BookingRooms.Add(bookingRoom); bookingRoom.Customers.Add(customer1); bookingRoom.Customers.Add(customer2); BookingViewBLL.CustomerSaveOrUpdate(customer1); BookingViewBLL.CustomerSaveOrUpdate(customer2); BookingViewBLL.BookingRoomSaveOrUpdate(bookingRoom); }