public void Dispose()
        {
            ComUtilities.ReleaseComObject(_designFile);
            _designFile = null;

            if (_isExternalApplication == false)
            {
                ComUtilities.ReleaseComObject(_application);
                _application = null;
            }

            ComUtilities.ReleaseComObject(_connector);
            _connector = null;
        }
 public void Open(string path)
 {
     _path       = path;
     _designFile = _application.OpenDesignFile(_path);
 }