ASP.NET MVC 3 Ajax.BeginForm and Html.TextBoxFor does not reflect changes done on the server

I'm using the Ajax.BeginForm helper in ASP.NET MVC3 to submit a form that replaces itself with new values in the form set on the server. However when I use helpers like Html.TextBoxFor I get the values that was submitted, not the values I inserted into the model on the server. For example; I set SomeValue to 4 in my action and show it in a textbox. I change the value to 8, hit submit and would expect the value to be changed back to 4 in the textbox, but for some reason it stays 8. But if I output SomeValue without using Html helpers it says 4. Anybody have some clue about what is going on? My controller: ``` public ActionResult Index(HomeModel model) { model.SomeValue = 4; if (Request.IsAjaxRequest()) return PartialView(model); return View(model); } public class HomeModel { public int? SomeValue { get; set; } } ``` My View (please not that I have all the needed javascript in my layout page): ``` <div id="ajaxtest"> @using(Ajax.BeginForm(new AjaxOptions{ InsertionMode = InsertionMode.Replace, UpdateTargetId = "ajaxtest", HttpMethod = "Post" })) { @Html.TextBoxFor(model => model.SomeValue) <input type="submit" value="Update" /> } </div> ```