MVC - Razor Syntax Dropdown List

       .cs

 public ActionResult Index()
        {
            List<City> citys = new List<City>();

            City city = new City();
            city.CityId = 1;
            city.Name = "Batman";

            citys.Add(city);

            SelectList selectListCity = new SelectList(citys, "CityId", "Name");
            ViewBag.dropdownCity = selectListCity;
            return View();
        }

       

    }
    public class City
    {
        public int CityId { get; set; }
        public string Name { get; set; }   

    }

. cshtml


@using (Html.BeginForm())
{
    @Html.DropDownList("CityId", (SelectList)ViewBag.dropdownCity, "Seçiniz", new { @class = "form-control dropdown" })
}