ViewModel data appears to be caching in Razor View

I have a web app that uses C# and Razor Views.  The flow of the function is as follows:

1. User selects New Hire Class from list and clicks on Select button (see first screen in attached file)
2. Any Ids or Flags assigned to the class are displayed and an Assign Ids / Flags button is displayed (see second screen in attached file)

Here is my problem
3. If the user selects a different New Hire Class from the dropdown and clicks select, the check boxes do not get updated with the data from the new selection (see third screen in attached file - the 1st check box  is checked and it shouldn't)

Through debugging, I have verified that the model being sent to the view is correct.

Here is my Controller Code:
        public ViewResult AssignIdsFlagsToClass()
        {
            _presentationLogic.SetAssignIdsFlagsToClassViewModel();
            return View(_presentationLogic.GetAssignIdsFlagsToClassViewModel());
        }

        [HttpPost]
        [MultipleButton(Name = "action", Argument = "GetIdsFlagsForClass")]
        public ViewResult GetIdsFlagsForClass(AssignIdsFlagsToClassViewModel vm)
        {
            _presentationLogic.SetAssignIdsFlagsToClassViewModel(HomePresenterTransformations.TransformAssignIdsFlagsToClassViewModel(vm));
            return View("AssignIdsFlagsToClass", _presentationLogic.GetAssignIdsFlagsToClassViewModel());
        }

        [HttpPost]
        [MultipleButton(Name = "action", Argument = "AssignIdsFlags")]
        public ActionResult AssignIdsFlags(AssignIdsFlagsToClassViewModel vm)
        {
            _idDManagementInteractor.AssignIdsFlagsToNewHireClass(
                HomeControllerTransformations.TransformAssignIdsFlagsToClassViewModelToRequest(vm));
            TempData[Alerts.SUCCESS] = "Ids and Flags successfully assigned to Class";
            return RedirectToAction("AssignIdsFlagsToClass", "Home");
        }

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Here is my Razor View:
    <h2>@ViewBag.Title</h2>

    @using (Html.BeginForm(null, null, FormMethod.Post, new {id = "AssignIdsFlagsToNewHireClassForm"}))
    {
        <div class="col-md-12 small">
            <div class="single-field col-md-4">
                <label class="control-label" for="SelectedClass">@Html.DisplayNameFor(model => model.SelectedClass) : </label>
                @Html.DropDownListFor(model => model.SelectedClass, Model.NewHireClasses)
                <span class="alert-error">@Html.ValidationMessageFor(model => model.SelectedClass)</span>
            </div>
            <div class="single-field col-md-4">
                <input type="submit" id="SelectBtn" value="Select" name="action:GetIdsFlagsForClass" class="btn btn-success col-md-4"/>
            </div>
            @if (Model.DisplayAssignButton)
            {
                <div class="single-field col-md-4">
                    <input type="submit" id="AssignBtn" value="Assign Ids/Flags" name="action:AssignIdsFlags" class="btn btn-success col-md-4" />
                </div>
            }
            <div style="clear: both"></div>
        </div>
        <div class="col-md-12">
            <h3>IDs</h3>
            @Html.EditorFor(model => model.Ids)
        </div>
        <div class="col-md-12">
            <h3>Flags</h3>
            @Html.EditorFor(model => model.Flags)
        </div>
    }

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Here is the Editor Template that is used by the model.Ids and model.Flags:
@model IDTPIApp.Models.DataStructures.FlagIdType
<div class="col-md-3 small">
    @Html.EditorFor(model => Model.IsSelected)@Html.HiddenFor(model => Model.TypeId)&nbsp; @Html.DisplayFor(model => model.DisplayName)
</div>

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When the user clicks on Assign Ids/Flags the screen is redisplayed without any IDs or Flags shown (see the 1st screen in the attached file).  In order to get this to work I had to redirect to the AssignIdsFlagsToClass() method rather than resetting the model and returning the View.

Does anyone know why the View is behaving this way?
RazorViews.jpg
dyaroshAsked:
Who is Participating?
 
Gautham JanardhanCommented:
The problem is the HtmlHelper is showing the ModelState value, which has the posted data.  you can try clearning the model state (ModelState.Clear();) but a better appraoch would be to have a controller/view which takes the selected value as parameter and renders the data.
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dyaroshAuthor Commented:
Thanks.  That is what I ended up doing but wasn't sure why I had to.
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