/// <summary>
        /// Disconnect the device
        /// and write closing message.
        /// </summary>
        public bool BtnDisconnect()
        {
            if (Spectrometer is null)
            {
                return(false);
            }

            if (Spectrometer.DisconnectDevice())
            {
                Front.My_msg("Closing");
                Spectrometer = null;
            }
            return(true);
        }