public static bool add(int productid, int qty)
{
int userid = Convert.ToInt32(HttpContext.Current.Session["auth_user"]);
List <Cart> carts = CartHandler.getCartsById(userid);
bool exist = false, exceed = false;
if (carts.Count != 0)
{
foreach (Cart product in carts)
{
if (product.ProductID == productid)
{
int newqty = qty + product.Quantity;
Product Product = ProductHandler.getProductByID(productid);
if (newqty > Product.Stock)
{
exceed = true;
}
else
{
Cart cart = getCart(productid, userid);
CartHandler.update(cart, newqty);
}
exist = true;
break;
}
}
}
if (!exist || carts.Count == 0)
{
CartHandler.Add(userid, productid, qty);
}
if (exceed)
{
return(false);
}
else
{
return(true);
}
}