private void btnSyncFromExcel_Click(object sender, RibbonControlEventArgs e)
        {
            var inspector = _app.ActiveInspector();
            var caption   = inspector.Caption;
            var mail      = inspector.CurrentItem as MailItem;

            //var session = inspector.Session;
            //var a = inspector.AttachmentSelection;
            if (mail == null)
            {
                return;
            }
            try
            {
                var contracts = ContractHelper.GetContracts(ContractHelper.GetContractFile());
                var helper    = new ContractHelper(this._app);
                helper.SyncContract(contracts);
            }
            finally
            {
                GC.Collect();
            }
            MessageBox.Show(Resources.Messagebox_Info_SyncFinished);
        }