private void btnContinue_Click(object sender, RoutedEventArgs e)
        {
            try
            {
                DataSet ds = cr.ImportQuantity(ExcelTable, usercode);
                MessageBox.Show(ds.Tables[0].Rows[0]["result"].ToString().Replace("<br>", "\n"));
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message);
            }

            btnContinue.IsEnabled = false;
        }