NullReferenceException in use DropDownListFor in ASP.NET MVC 5
asp.net-mvc, c#, dropdownlistfor, nullreferenceexception
Solution
I think you forgot to pass your ViewModel object to your view, see below:
public ActionResult YourAction()
{
return View(new YourViewModel());
}
Problem
I can't find the answer why I'm getting NullReferenceException when I'm trying to use DropDownListFor() like this: View: ``` <div class="form-group"> @Html.LabelFor(m => m.Category, new { @class = "col-md-2 control-label" }) <div class="col-md-10"> @Html.DropDownListFor( m => m.Category, new SelectList(Model.CategoryOptionsList, "CategoryOptionId", "Value", Model.CategoryOptionsList.First().CategoryOptionId), new { @class = "form-control" } ) </div> </div> ``` ViewModel: ``` public class CategoryOption { public int CategoryOptionId { get; set; } public string Value { get; set; } } public IEnumerable<CategoryOption> CategoryOptionsList = new List<CategoryOption> { new CategoryOption { CategoryOptionId = 0, Value="Rock" }, new CategoryOption { CategoryOptionId = 1, Value="Jazz" }, new CategoryOption { CategoryOptionId = 2, Value="Pop" }, new CategoryOption { CategoryOptionId = 3, Value="Metal" }, new CategoryOption { CategoryOptionId = 4, Value="Folk" } }; [Required] [Display(Name = "Kategoria")] public string Category { get; set; } ```