public ActionResult Index()
        {
            var model = new RegionViewModel();
            this.BuildViewModel(model);

            return View(model);
        }
        public ActionResult Index(RegionViewModel model)
        {
            if (!ModelState.IsValid)
            {
                return View(model);
            }

            return RedirectToAction("Index", "SelectionDate", new { regionId = model.RegionId });
        }
 private void BuildViewModel(RegionViewModel model)
 {
     model.Regions = this.regionService.GetAll().ToList();
 }