cont

public ActionResult AddToCart(Products prod, int amount)
        {
            if (Session["Permission"] == null) // First check the user is logged in
                return View("NoUser");
            if (((string)Session["Permission"]).Equals("ADMIN")) // Admin cannot add any products into cart
                return View("AdminNotAllowed");

            if (amount == 0)
                return View("ZeroAmount");
            if (amount <= -1)
                return View("ErrorAmount");
            if (amount > prod.AvailableQuantity)
                return View("OutofstockAmuont");

            // Update the 'AvailableQuantity' of the specific product in the data base
            var filter = Builders<Products>.Filter.Eq("Id", prod.Id);
            var update = Builders<Products>.Update.Set("AvailableQuantity", prod.AvailableQuantity - amount);
            DBManager.UpdateDetails(filter, update);

            if (Session["Cart"] == null) // If the cart is empty of products
            {
                ((List<Products>)(Session["Cart"])).Add(prod);
                ViewBag.cart = ((List<Products>)(Session["Cart"])).Count();
                Session["Count"] = 1;

                Amounter f = new Amounter
                {
                    productAmount = amount,
                    productID = prod.Id
                };

                ((List<Amounter>)(Session["Amounts"])).Add(f);
            }

            else // There are already products in the cart
            {
                var obj = ((List<Amounter>)(Session["Amounter"])).FirstOrDefault(x => x.productID == prod.Id);

                if (obj.Equals(null)) // If there is no such product in the list, but the list is not empty
                {
                    ((List<Products>)Session["Cart"]).Add(prod);
                    ViewBag.cart = ((List<Products>)Session["Cart"]).Count();
                    Session["Count"] = Convert.ToInt64(Session["Count"]) + 1;

                    Amounter f = new Amounter
                    {
                        productAmount = amount,
                        productID = prod.Id
                    };
                    ((List<Amounter>)Session["Amounts"]).Add(f);
                }

                else // There specific product already presents in the list
                {
                    ((List<Amounter>)(Session["Amounter"])).Remove(obj); // Remove the 'old' product
                    obj.productAmount += amount;
                    ((List<Amounter>)(Session["Amounter"])).Add(obj); // Adding the updated product
                }
            }

            return RedirectToAction("DisplayAllProducts", "Products"); // Go to view of the products
        }