public string QueryCallid() { fgMgr = new FgroupMgr(mySqlConnectionString); string json = string.Empty; try { json = fgMgr.QueryCallid(); } 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; }