ASP.NET MVC @Html.DropdownListFor wrong selected value

I know there are tons of question about this (this this and this) are some of the questions I read, but I did not found anything that helped:

In my View I have

@Html.DropDownListFor(m => m.AktPriority, CustomHTMLHeper.GetPriorityDropDown(),new { @class = "form-control" })

In my helper

    public static SelectList GetPriorityDropDown()
    {

        List<SelectListItem> result = new List<SelectListItem>();
        SelectListItem low = new SelectListItem();
        low.Value = "0";
        low.Text = "Niedrig";
        SelectListItem middle = new SelectListItem();
        middle.Value = "1";
        middle.Text = "Mittel";
        SelectListItem high = new SelectListItem();
        high.Value = "2";
        high.Text = "Hoch";
        return new SelectList(new SelectListItem[] { middle, high, low }, "Value", "Text", "1");

    }

I expect the item with the value 1 to be selected but following HTML is generated:

<select name="AktPriority" id="AktPriority" class="form-control">
  <option value="1">Mittel</option>
   <option value="2">Hoch</option>
    <option value="0" selected="selected">Niedrig</option>
   </select>

I also tried setting the Selected Property to true in the helper. This did not work either.

You did not post your action method, but if you use DropDownListFor you need to set the "selected" value in the model:

model.AktPriority = "1";

return View(model);