public DTwainDemo()
        {
            //
            // Required for Windows Form Designer support
            //
            InitializeComponent();

            //
            // TODO: Add any constructor code after InitializeComponent call
            //
            sOrigTitle = this.Text;
            TwainAPI.DTWAIN_SysInitialize();
            SelectedSource = 0;
            if (TwainAPI.DTWAIN_IsTwainAvailable() == 0)
            {
                SelectSource.Enabled          = false;
                SelectSourceByNameBox.Enabled = false;
            }
        }