public string QueryContact() { _vendorMgr = new VendorMgr(connectionString); string json = string.Empty; json = "[]"; try { if (!string.IsNullOrEmpty(Request.QueryString["vendor_id"])) { Vendor ven = new Vendor(); ven.vendor_id = Convert.ToUInt32(Request.QueryString["vendor_id"]); json = _vendorMgr.QueryContanct(ven); } } catch (Exception ex) { Log4NetCustom.LogMessage logMessage = new Log4NetCustom.LogMessage(); logMessage.Content = string.Format("TargetSite:{0},Source:{1},Message:{2}", ex.TargetSite.Name, ex.Source, ex.Message); logMessage.MethodName = System.Reflection.MethodBase.GetCurrentMethod().Name; log.Error(logMessage); json = "[]"; } return json; }