private void unsubscribeFromEvents()
{
if (_fileBrowserScanner != null)
{
_fileBrowserScanner.FormClosing -= _form_FormClosing;
_fileBrowserScanner.EvtFileOpen -= _fileBrowserScanner_EvtFileOpen;
_fileBrowserScanner.EvtDone -= _form_EvtDone;
_fileBrowserScanner.EvtShowScanner -= _fileBrowserScanner_EvtShowScanner;
}
}