public JsonResult ProductTracking(string term)
        {
            try
            {
                var items = RepairManager.GetByTracking(term.Trim());

                if (items == null)
                {
                    return(Json(new { result = "ไม่พบข้อมูล/not found." }, JsonRequestBehavior.AllowGet));
                }
                else
                {
                    TrackingCounterManager.IncreaseNextItemNo();
                    return(Json(new { result = items.vProductTracking }, JsonRequestBehavior.AllowGet));
                }
            }
            catch (Exception ex)
            {
                return(Json(new { result = "ไม่พบข้อมูล/not found." }, JsonRequestBehavior.AllowGet));
            }
        }