public ActionResult Create(Stock stock)
 {
     try
     {
         using (var db = new ApplicationDbContext())
         {
             var data = db.Stocks.Where(a => a.Id == stock.Id).FirstOrDefault();
             StockHelper.GerCurrentPrice(stock);
             if (stock.Id == 0 || data == null)
             {
                 db.Stocks.Add(stock);
             }
             else
             {
                 data.StockCode    = stock.StockCode;
                 data.StockName    = stock.StockName;
                 data.Category     = stock.Category;
                 data.CurrentPrice = stock.CurrentPrice;
             }
             db.SaveChanges();
             return(Json("done"));
         }
     }
     catch (Exception ex)
     {
         return(Json(ex.Message));
     }
 }