public ActionResult CapNhatSoLuong(string maSp, int soLuong)
{
int id = Convert.ToInt32(maSp.Substring(7, maSp.Length - 7));
GioHang objCart = (GioHang)Session["Cart"];
if (objCart != null)
{
if (objCart.CapNhatSoLuong(id, soLuong))
{
Session["Cart"] = objCart;
}
}
return(RedirectToAction("index"));
}