public string QueryZip()
        {
            zMgr = new ZipMgr(mySqlConnectionString);
            string json = string.Empty;
            try
            {
                if (!string.IsNullOrEmpty(Request.Form["topValue"]))
                {
                    json = zMgr.QuerySmall(Request.Form["topValue"].ToString(), Request.Form["topText"].ToString());
                }

            }
            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;
        }