模型状态推断-模型A如何同时是两个不同的东西?

我有这个

<%=Model.StartDate%>
<%=Html.Hidden("StartDate", Model.StartDate)%>

它输出:

 2010-05-11 11:00:00 +01:00      
 <input type="hidden" value="2010-03-17 11:00:00 +01:00" name="StartDate" id="StartDate"> 

什么…

这是一种分页机制,因此隐藏值在第一页上是有效的,我已经能够前进到下一页了。但是,由于值不能正确更新,它就到此结束。

我需要做什么?

使用火狐。

更新-更多代码

using (Html.BeginForm("Program", "Activities", null, FormMethod.Get, new { @name = "ProgramForm", id = "ProgramForm" }))
{ 

.

        viewModel.StartDate = pagingService.StartDate;
        return View(viewModel);

更新-完成操作

    [Authorize]
    public ActionResult Program(string[] submit)
    {
        var viewModel = new ActivityProgramViewModel { UserID = LoggedInUser.UserID };
        viewModel.Fresh = true;

        TryUpdateModel(viewModel);

        var pagingService = new OccurencePagingService(LoggedInUser.AllActivities.Where(a => a.StartTime != null));

        if (!viewModel.Fresh)
        {
            pagingService.StartDate = ((DateTimeOffset)viewModel.StartDate);
            pagingService.EndDate = ((DateTimeOffset)viewModel.EndDate);
        }

        if (submit != null)
            if (submit.Contains("MoveBack"))
                pagingService.MoveBack();
            else if (submit.Contains("MoveForward"))
                pagingService.MoveForward();

        ViewData.Model = viewModel;

        viewModel.Occurrences = pagingService.GetOccurences();
        viewModel.Fresh = false;

        viewModel.HasLess = pagingService.HasLess;
        viewModel.HasMore = pagingService.HasMore;

        viewModel.StartDate = pagingService.StartDate;
        viewModel.EndDate = pagingService.EndDate;

        return View();
    }