public ActionResult AddItem(Item item)
        {
            var list = new ItemDataAccess().FindAll <Item>();

            item.Id          = list.Count == 0 ? 1 : list.Last().Id + 1;
            item.Name        = Request.Form["Name"];
            item.Description = Request.Form["Description"];
            item.Cost        = double.Parse(Request.Form["Cost"]);
            item.NT          = int.Parse(Request.Form["NT"]);
            item.Weight      = double.Parse(Request.Form["Weight"]);
            item.Formula     = Request.Form["Formula"];
            new ItemDataAccess().InsertOne(item);
            return(RedirectToAction("Main", "Admin"));
        }