public List <SaleItem> GetRecommendItem()
        {
            FrontDeskRequest frontdesk = FrontDeskRequestControl.GetService(callBackId);

            try
            {
                return(ItemDao.GetRecommendSaleItem());
            }
            catch (HCSMSException ex)
            {
                raiseError(ex);
                if (frontdesk != null)
                {
                    frontdesk.ErrorMessage(new ErrorEventArgs("", ex));
                }
                return(null);
            }
            catch (Exception ex)
            {
                raiseError(ex);
                return(null);
            }
        }