//private 客戶資料Entities db = new 客戶資料Entities();

        // GET: 客戶資料
        public ActionResult Index(int?page)
        {
            var pageNumber = page ?? 1;
            var data       = repo.All().OrderBy(x => x.Id).ToPagedList(pageNumber, 1);

            ViewBag.classification = new SelectList(repo.DropDownList());

            return(View(data));
        }