public ActionResult AddToCart(int productID)
{
Dictionary <int, Item> dct = new Dictionary <int, Item>();
List <Item> lst = new List <Item>();
List <Item> lstNew = new List <Item>();
if (Session["cart"] != null)
{
lst = (List <Item>)Session["cart"];
var temp = hivm.lstCart(productID);
var unionlst = lst.Union(temp);
foreach (var item in unionlst)
{
if (!dct.ContainsKey(item.product.ProductID))
{
dct.Add(item.product.ProductID, item);
}
else
{
item.quantity += lst.Where(v => v.product.ProductID == item.product.ProductID).Select(av => av.quantity).FirstOrDefault();
dct[item.product.ProductID] = item;
}
}
lstNew = dct.Select(v => v.Value).ToList();
Session["cart"] = lstNew;
}
else
{
Session["cart"] = hivm.lstCart(productID);
}
return(RedirectToAction("Index"));
}