public JsonResult GetLocationsPrefix(string id)
        {
            List <SelectListItem> LocPrefix = new List <SelectListItem>();

            LocPrefix.Add(new SelectListItem {
                Text = "Tất cả", Value = "0"
            });
            if (!string.IsNullOrEmpty(id))
            {
                foreach (var lp in db.FPT_CIR_GET_LOCLIBUSER_PREFIX_SEL((int)Session["UserID"], Int32.Parse(id)))
                {
                    if (!lp.Contains("LV"))
                    {
                        LocPrefix.Add(new SelectListItem {
                            Text = Regex.Replace(lp.ToString(), @"[^0-9a-zA-Z]+", ""), Value = lp.ToString()
                        });
                    }
                }
            }
            return(Json(new SelectList(LocPrefix, "Value", "Text")));
        }