public ActionResult Create()
    {
        return View();
    } 

    //
    // POST: /Partial/Create

    [HttpPost]
    public ActionResult Create(last_name ln)
    {

        try
        {
            // TODO: Add insert logic here
            proba.AddTolast_name(ln);
            proba.SaveChanges();
            return View(); 
        }
        catch
        {
            return View();
        }
    }

Part of index View:

  <div id="Div1">

 <% using (Ajax.BeginForm("Create", new AjaxOptions { UpdateTargetId = "Div1" }))

   { %>
<%= Html.Action("Create")%>
<% } %>

</div>

In this solutions data from from View Create not post to database. In this solutions data posted to database

<div id="Div1">

<%= Html.Action("Create")%>

</div>

View "Create" is strongly typed view. Why is this happening ie why the first solution does not work?