private void Delete_Btn_Click(object sender, RoutedEventArgs e)
        {
            int Id     = Convert.ToInt16(IdSO_Txt.Text);
            var result = iSalesOrder.DeleteSalesOrder(Id);

            if (result)
            {
                MessageBox.Show("Delete Success");
                dataGridSalesOrder.ItemsSource = iSalesOrder.get();
            }
            else
            {
                MessageBox.Show("Delete Failed");
            }
        }