Strange error after getting Value from Html.DropDownList

Question

I crated SelectList selectList with data from my Entities. And now I want send value from DropDownList to Entitie. everything is OK (I got value from selected item) , but I got his error et the end

An exception of type 'System.InvalidOperationException' occurred in System.Web.Mvc.dll but was not handled in user code Additional information: There is no ViewData item of type 'IEnumerable' that has the key 'Przelew.DaneKont'.

 @Html.DropDownList("Przelew.DaneKont", ViewBag.DaneKontList as SelectList, "-- Wybierz kontot --")

Viewmodel:

 @Html.DropDownList("Przelew.DaneKont", ViewBag.DaneKontList as SelectList, "-- Wybierz kontot --")

Controller:

[Authorize]
        [HttpGet]
        public ActionResult WykonajPrzelew( ) {



            using (var context = new BankAppEntities1())
            {
                konto = context.Konto.SqlQuery("SELECT * FROM dbo.Konto WHERE UserId = '" + userIdValue + "' ").ToList();

            }


            WykonajPrzelewMultipleView mymodel = new WykonajPrzelewMultipleView();
            mymodel.Konta = konto;

            List<SelectListItem> items = new List<SelectListItem>();


            foreach (var item in konto){

                items.Add(new SelectListItem { Text = item.Nazwa+ "  Saldo :"+item.Saldo , Value = item.KontoId+"" });

             }

            ViewBag.DaneKont = items;

            SelectList selectList = new SelectList(items, "Value", "Text");
            ViewBag.DaneKontList = selectList;




            return View(mymodel);
        }


      [Authorize]
        [HttpPost]
        public ActionResult WykonajPrzelew(WykonajPrzelewMultipleView model)
        {



            string imie = model.Przelew.ImieOdbiorcy;
            string nazwisko = model.Przelew.NazwiskoOdbiorcy;
            int numerOdbiorcy = Convert.ToInt32(model.Przelew.NumerRachunkuOdbiorcy);
            int kontoID = Convert.ToInt32(model.Przelew.DaneKont); // I got Value from List 

            string tytul = model.Przelew.Tytuł;
            string ulica = model.Przelew.Ulica;
            string numerdomu = model.Przelew.nrdomu;
            string kod = model.Przelew.Kodpocztowy;
            string miasto = model.Przelew.Miasto;
       string tyt =model.Przelew.Tytuł;
            decimal kwota = model.Przelew.Kwota;
            DateTime date = System.DateTime.Now;



            using (var context2 = new BankAppEntities1())
            {
                var dane = new Przelew { Imie = imie, Nazwisko = nazwisko, NumerKontaOdbiorcy = numerOdbiorcy, KontoId = "1", NumerKontaNadawcy = 3444666, Ulica = ulica, Nr_domu = numerdomu,Kod_pocztowy="343", Miasto = miasto, Typ = "Normlany", UserId = userIdValue,Kwota=kwota , Date=date , Tytul=tyt };
                context2.Przelew.Add(dane);

                context2.SaveChanges();
            }

            return View();
        }

Answer 1

You need another property on your model such as DaneKont, and change your view to the following:

@Html.DropDownList("DaneKont", (SelectList)ViewBag.DaneKontList, "-- Wybierz kontot --")

On postback, DaneKont will hold the selected value.