private async void AddCategory_Click(object sender, RoutedEventArgs e)
{
var cate = new CategoryDialog(conn);
cate.Closing += this.UpdateListCategory;
await cate.ShowAsync();
}
private async void EditCategory_Click(object sender, RoutedEventArgs e)
{
Button btn = sender as Button;
Category category = ListCategory.Where(x => x.CategoryID == int.Parse(btn.Tag.ToString())).ToList().ElementAt(0);
var cate = new CategoryDialog(conn, category);
cate.Closing += this.UpdateListCategory;
await cate.ShowAsync();
}