public ActionResult Index(SelectDemoModel model)
        {
            Debug.WriteLine("SelectDemoController.Index(SelectDemoModel)");
            model.Message = string.Format("ModelState.IsValid: {0}", ModelState.IsValid);

            return View(model);
        }
        //
        // GET: /SelectDemo/

        public ActionResult Index()
        {
            var model = new SelectDemoModel();
            return View(model);
        }