Html.HiddenFor() isn't updated correctly

public class SectionQuestionsViewModel
{
    public int MdsId { get; set; }
    public int SectionId { get; set; }
    public int PrevSectionId { get; set; }
    public int NextSectionId { get; set; }
    public SectionQuestionColl answers { get; set; }
}

And the razor code looks like this:

@using (Html.BeginForm(new { mdsId = @Model.MdsId, sectionId = @Model.SectionId}))
{
    @Html.HiddenFor(x => x.PrevSectionId)
    @Html.HiddenFor(x => x.NextSectionId)

    @* ... snip ... *@
}

The first time in, the Prev/Next values are {0,3}, when the user clicks on the next button, they get section 3. The code, all the way to the @Model in the view, shows that the Prev/Next are {2,4}, but when I look at the HTML, the values are still {0,3}.

What is going on?

Sam

Re: Html.HiddenFor() isn't updated correctly

The form submit takes precedence over the modified in the action.

Please use ModelState.RemoveKey("PrevSectionId")