private void SearchByNameBtn_Click(object sender, RoutedEventArgs e)
 {
     if (string.IsNullOrWhiteSpace(CheckInCheckOutSearchTbx.Text))
     {
         MessageBox.Show("请填写姓名!");
     }
     else
     {
         try
         {
             searchbyRooms = false;
             CheckInCheckOutDataGrid.ItemsSource = facade.GetActiveBookingsViaName(CheckInCheckOutSearchTbx.Text);
             if (CheckInCheckOutDataGrid.Items.Count == 0)
             {
                 MessageBox.Show("找不到联系人或订单");
             }
         }
         catch (Exception)
         {
             MessageBox.Show("格式不正确!");
         }
     }
 }