public JsonResult AddReason(string reason)
        {
            int id = db.HOLDING_REMOVE_REASON.Select(a => a.ID).Count();

            ViewBag.Success = db.FPT_ADD_REASON(id + 1, reason);
            ViewBag.Success = "Thêm thành công";

            return(Json(ViewBag.Success, JsonRequestBehavior.AllowGet));
        }