I have the following code

XPathNodeIterator iterator2 = umbraco.library.GetPreValues(1075);
            iterator2.MoveNext(); //move to first
            XPathNodeIterator preValues2 = iterator2.Current.SelectChildren("preValue", "");
            while (preValues2.MoveNext())
            {
                string preValue2 = preValues2.Current.Value;
                int preValueId2 = preValues2.CurrentPosition;

                ListeOfTeamNumbers.Add(new SelectListItem
                {
                    Text = preValue2,
                    Value = preValue2
                });
                modal.ListeOfTeamNumbers = ListeOfTeamNumbers;

which will grab the datatype i have and send the values to a dropdownlist. This Works perfectly, but then when i want to grab the value and add it inside my ContentService.CreateContent like this

var nytHold = Services.ContentService.CreateContent(modal.SelectedYear + " - " + modal.SelectedTeamNumber.ToString(), 1161, "Hold");
            nytHold.SetValue("argang", modal.SelectedYear);
            nytHold.SetValue("holdnummer", modal.SelectedTeamNumber);
            nytHold.SetValue("holdetsTilknyttedeTraenere", modal.ListOfSelectedClubs);
            nytHold.SetValue("holdetsKlub", modal.ListOfSelectedTrainers);
            Services.ContentService.SaveAndPublishWithStatus(nytHold);
            TempData["formStatus"] = "Holdet blev oprettet";
            return RedirectToCurrentUmbracoPage();