Hi everybody.

I have this:
Controller:
[code]
public ActionResult Index()
    {         //var cats = faqCategorieService.GetAll().ToList();          var categories = faqCategorieService.GetAll().OrderBy(x => x.Naam)             .Select(a => new FaqOverviewModel()             {                 Id = a.Id,                 Naam = a.Naam             }).ToList();          foreach (var categorie in categories)         {             categorie.Naam = categorie.Naam + " (" + categorie.Id.ToString() + ")";         }          categories.Insert(0, new FaqOverviewModel() { Id = -1, Naam = "Maak een keuze..." });            return View();     }
[/code]

ModelView:

[code]
private readonly ListCategorie;
    public int SelectedCategoriedFaqId { get; set; }     public IEnumerable FAQCategorieItems     {          get         {             return new SelectList(Categorie, "Id", "Naam");         }      }
[/code]

View:

[code]
@using Multitask.Regenboog.Medicijnverstrekking.Domain
@model Multitask.Regenboog.Medicijnverstrekking.WebApplication.ViewModels.FAQ.FaqOverviewModel

@{
ViewBag.Title = "Index";
}

Support

@using (Html.BeginForm())
{
//if (Model.ZorgverzekeraarInvoerEnabled) //{      @Html.LabelFor(model => model.SelectedCategoriedFaqId, "Categorie:")     @Html.DropDownListFor(x => x.SelectedCategoriedFaqId, Model.FAQCategorieItems )     //@Html.HiddenFor(model => model.ZorgverzekeraarInvoerEnabled)  @*
     @Html.LabelFor(m => m) 
*@ @*
     @Html.LabelFor(model => model.SelectedSubCategorieFaqId, "Onderwerp:")     @Html.DropDownListFor(m => m.SelectedSubCategorieFaqId, Model.FaqSubCategorieItems, new { style = "width: 150px" }) 
*@   @Html.LabelFor(model => model.EmailBericht, "Bericht:") @Html.TextAreaFor(x => x.EmailBericht)  @*}*@
[/code]

Now if I loop through the Index from the Controller I see nice the data

But in the view I get this error:

An exception of type 'System.NullReferenceException' occurred in App_Web_qdasymuj.dll but was not handled in user code

Additional information: Object reference not set to an instance of an object.

By this dropdownListFor:

>@Html.LabelFor(model => model.SelectedCategoriedFaqId, "Categorie:")
    @Html.DropDownListFor(x => x.SelectedCategoriedFaqId, Model.FAQCategorieItems )
Thank you