private async void AddProduct_Click(object sender, RoutedEventArgs e)
{
var product = new ProductDialog(conn);
product.Closing += this.UpdateListProduct;
await product.ShowAsync();
}
private async void EditProduct_Click(object sender, RoutedEventArgs e)
{
var btn = sender as Button;
var productSelect = ListProduct.First(x => x.ProductID == int.Parse(btn.Tag.ToString()));
var product = new ProductDialog(conn, productSelect);
product.Closing += this.UpdateListProduct;
await product.ShowAsync();
}
