public DeviceNotification add(DeviceNotification deviceNotification)
        {
            logger.Info("Add DeviceNotification: ");
            try
            {
                if (deviceNotification == null)
                {
                    throw new ArgumentNullException("deviceNotification");
                }
                context.AddDeviceNotification(deviceNotification);
                logger.Info("End  Add deviceNotification: ");
                return(deviceNotification);
            }
            catch (Exception ex)
            {
                logger.Error("Error in Add deviceNotification " + ex.Message);

                return(null);
            }
        }