Controller return incorrect data with ajax ActionLink in mvc - ajax

Question

several days ago with searching i put an ajax button inside my page, but i didn't know the issue till now, the thing is happen, is that the result i receive is not the result from ajax redirection, but is result from first processing (though i was wonder why it do it twist)...
And what i wanna do is perform filtering through link button instead of button.
so i have two action, one is for my ajax button, and second for my index:
1.
[AcceptVerbs(HttpVerbs.Post)]
public ActionResult ChooseCategoryAction(int? id)
{
Monitor.Enter(monitorObj);
// Save code here...
Session.Add("FilterCategory", id);
return RedirectToAction("Index");
}
2.
public override ActionResult Index()
{
.
.
.
int? id = (Session["FilterCategory"] != null) ? int.Parse(Session["FilterCategory"].ToString()) : (int?)null;
List<LinkEntity> filterList = null;
int catId = id ?? -1;
if (catId != -1)
{
filterList = new List<LinkEntity>();
foreach (LinkEntity linkEntity in linkList.Where(
where =>
(catId == 0 && #where.Category == null) ||
(#where.Category != null && #where.Category.Id == catId)).Select(
select =>
new LinkEntity(#select.Id, #select.Name, #select.Link, #select.Description,
#select.Category)))
{
filterList.Add(linkEntity);
}
}
else
{
filterList = linkList;
}
return View(filterList);
}
My View is like this:
<div class="split-left">
#if (ViewBag.CategoriesTags != null)
{
foreach (var cat in ViewBag.CategoriesTags)
{
<div class="link-item-category">
#using (Html.BeginForm())
{
#Ajax.ActionLink((string)cat.Name, "ChooseCategoryAction","Home", new { id = cat.Id }, new AjaxOptions { HttpMethod = "POST" }, new{#class = "category-link"})
}
</div>
}
}
</div>
When i click the link it should goes to Ajax method, then inbox, filter my data and return a view, but it first goes to inbox, then to Ajax, again to inbox, next it goes value seem to be true, but result which return is incorrect
i also before reaching to filtering step, tried following:
#Html.Hidden(((int)cat.Id).ToString())
#Html.ActionLink((string)cat.Name, "ChooseCategoryAction", "Home", null, new { #class = "category-link", onclick = "return false;" })
with following script:
<script type="text/javascript">
$(document).ready(function () {
$('.category-link').click(function () {
$(this).closest('form')[0].submit();
});
});
</script>
But it don't return to controller or don't refresh page