/// <summary>
        /// Is spectrometer unplugged?
        /// If yes, press Stop and Disconnect buttons.
        /// </summary>
        /// <returns>Removed?</returns>
        private bool CheckDeviceRemoved()
        {
            bool removed = Spectrometer.CheckDeviceRemoved();

            if (removed)
            {
                Front.My_msg(string.Format("Spectrometer status: {0}", Spectrometer.Status()));
                Front.Disconnect();
            }
            return(removed);
        }