public void Add(string inventoryItem) { var InventoryItems = Request.Cookies["InventoryItems"]; if (InventoryItems == null) { HttpCookie Inventory = SessionInformation.CreateCookie("InventoryItems", inventoryItem); Response.Cookies.Add(Inventory); } else { InventoryItems.Value = InventoryItems.Value + "+" + inventoryItem; Response.Cookies.Add(InventoryItems); } }