public void ChangeReservation(List<PreorderTable> tableList)
        {
            using (ReservationService.ReservationServiceClient proxy = new ReservationService.ReservationServiceClient())
            {
                try
                {
                    proxy.Open();
                    foreach (PreorderTable table in tableList)
                    {
                        proxy.ChangeReservation(table);
                    }

                }
                catch (FaultException<HCSMSException> ex)
                {
                    raiseError(ex);
                }
                catch (Exception ex)
                {
                    raiseError(ex);
                }
                finally
                {
                    proxy.Close();
                }
            }
        }
        public List<PreorderTable> GetReservation()
        {
            using (ReservationService.ReservationServiceClient proxy = new ReservationService.ReservationServiceClient())
            {
                try
                {
                    proxy.Open();

                    return proxy.GetReservationList().ToList();

                }
                catch (FaultException<HCSMSException> ex)
                {
                    raiseError(ex);
                    return null;
                }
                catch (Exception ex)
                {
                    raiseError(ex);
                    return null;
                }
                finally
                {
                    proxy.Close();
                }
            }
        }