protected void Page_Load(object sender, EventArgs e) { MessageFilter filter = null; try { string itemGuid = Request.QueryString["ItemGuid"]; GetMessageControl(); filter = new MessageFilter(); filter.Guid = new Guid(itemGuid); var resultObj = a_control.GetMessageTrackByGuid(filter); a_result = JsonConvert.SerializeObject(resultObj); } catch (Exception) { } }