private void SaveProductButton_Click(object sender, RoutedEventArgs e)
{
Product product = new Product();
product.Name = ProductName.Text;
product.Kcal = float.Parse((ProductKCAL.Text).ToString());
product.Quantity = int.Parse((Quan.Text).ToString());
product.Unit = Unit.Text;
DataBaseSolution.AddProduct(product);
ProductName.Clear();
ProductKCAL.Clear();
Unit.ClearValue(NameProperty);
Quan.Clear();
}