public JsonResult StatisticSubmit(int lotrinh, int kyghi)
        {
            BillDao db     = new BillDao();
            var     result = new StatisticViewModel();

            if (lotrinh == 0 && kyghi == 0)
            {
                result = db.StatisticAll();
            }
            else if (lotrinh != 0 && kyghi == 0)
            {
                result = db.StatisticLT(lotrinh);
            }
            else if (lotrinh == 0 && kyghi != 0)
            {
                result = db.StatisticKG(kyghi);
            }
            else
            {
                result = db.StatisticLTKG(lotrinh, kyghi);
            }
            var data = new { lt_ten = result.lt_ten, k_ten = result.k_ten, soho = result.soho, sonuoc = result.sonuoc, tongtien = result.tongtien };
            var j    = Json(data, JsonRequestBehavior.AllowGet);

            return(j);
        }