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); } }