protected void Page_Load(object sender, EventArgs e)
{
Crt cart = SessionHelper.GetCart(Session);
csQuantity.InnerText = cart.Lines.Sum(x => x.Quantity).ToString();
csTotal.InnerText = cart.ComputeTotalPrice().ToString("c");
csLink.HRef = RouteTable.Routes.GetVirtualPath(null, "cart", null).VirtualPath;
}