private void ProductQuantityInShoppingCartChangedEventHandler(ProductQuantityInShoppingCartChanged e)
{
ShoppingCartItem item = _items.Find(i => i.ProductId == e.ProductId);
item.Quantity = e.NewQuantity;
}
public void ChangeProductQuanity(Guid productId, int newQuantity)
{
var e = new ProductQuantityInShoppingCartChanged(Id, productId, newQuantity);
ApplyEvent(e);
}
