private void ConfirmButton_Click(object sender, RoutedEventArgs e)
 {
     if (_paymentIdLen > 6 && _paymentIdLen <= 13)
     {
         TransactionInfo.BillRequest.PaymentId = PaymentIdBox.Text;
         TransactionInfo.GoToPage(Pages.InputBillRequestIdPage);
     }
     else
     {
         LabelMessage.Content = "شناسه پرداخت وارد شده صحیح نمی باشد";
         PaymentIdBox.Focus();
     }
 }
 private void UserControl_Loaded(object sender, RoutedEventArgs e)
 {
     PaymentIdBox.Focus();
 }