private void btnDeleteSsales_Click(object sender, RoutedEventArgs e)
 {
     try
     {
         DataRowView rowview = dgCurrentSales.SelectedItem as DataRowView;
         string      salesId = rowview.Row["Id"].ToString();
         DataTable   dt      = CustomerBLL.getCustomerBySales(salesId);
         if (dt.Rows.Count == 0)
         {
             SalesBLL.updateSalesIsEnable(salesId, "0");
             SetCurrentSales();
         }
         else
         {
             System.Windows.Forms.MessageBox.Show("該業務尚有客戶,請先轉移客戶至其他業務人員", "Message");
         }
     }
     catch
     {
         System.Windows.Forms.MessageBox.Show("請先選擇要刪除的業務人員", "Message");
     }
 }