private string GetDeviceSensors(HttpContext context)
        {
            string strJson     = string.Empty;
            string strDeviceId = context.Request.Params["DeviceId"];

            Data.DataHelper           dataHelper = new Data.DataHelper();
            Data.SensorInfoCollection items      = dataHelper.GetSensorInfos(strDeviceId);
            strJson = items.ToJsonString();

            return(strJson);
        }