private void adjust_quantity_Click(object sender, RoutedEventArgs e) { int quantity = 0; if (newColor.Text != "" && int.TryParse(newColor.Text, out quantity) == true) { product.Quantity_Available = quantity; ProductTableData.updateProductQuantity(quantity, product.ID); this.Close(); } else { Xceed.Wpf.Toolkit.MessageBox.Show("Invalid value. Pres ok to exit.", "Invalid", MessageBoxButton.OK, MessageBoxImage.Error, MessageBoxResult.OK); } }