internal override void Dispose(bool disposing)
        {
            if (disposing)
            {
                // Free managed
                if (_workbooks != null)
                {
                    _workbooks.Dispose();
                    _workbooks = null;
                }

                if (_eventSink != null)
                {
                    _eventSink.Dispose();
                    _eventSink = null;
                }
            }

            base.Dispose(true);
        }
        internal override void Dispose(bool disposing)
        {
            if (disposing)
            {
                // Free managed
                if (_workbooks != null)
                {
                    _workbooks.Dispose();
                    _workbooks = null;
                }

                if (_eventSink != null)
                {
                    _eventSink.Dispose();
                    _eventSink = null;
                }
            }

            base.Dispose(true);
        }