omit post back in making pages numbers

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MVC

i wanna make some thing like this ( << 1 2 3 4 >> ) end of my view . i used HTML.BeginForm and it worked .but i had post back.so i changed HTML.BeginForm to Ajax.BeginForm , now it dose not work

for example when i click on link 2 i get this error in fire bug

"  NetworkError: 500 Internal Server Error - http://localhost/myAction/search? pagenumber=2"

view:

     @using (Ajax.BeginForm( "search ","MyAction",new AjaxOptions
            {
                HttpMethod = "POST",
                InsertionMode = InsertionMode.Replace,
                UpdateTargetId = ""
            }))
            {
          int page = (int)ViewBag.page;
          int pages = (int)ViewBag.pages;

         <div class="pagination pagination-left">
        <ul>
            <li>@Ajax.ActionLink("«", "MyAction", new { numberpage = pages })</li>
            @{for (int i = pages; i >= 1; i--)
              {
...
                  if (i == page)
                  {
                <li class="active">@HtmlAjax.ActionLink(i.ToString(), " MyAction ",  new { numberpage = i })</li>
                  }
                  else
                  {
                <li>@Ajax.ActionLink(i.ToString(), " MyAction ", new { numberpage =  i  })</li>
                  }
              }
            }
            <li>@Ajax.ActionLink("»", " MyAction ", new { numberpage = 1 })</li>

        </ul>


    </div>

controller :

[HttpPOST]
  public ActionResult search(int? numberpage)
  {
      int skip = 0;
      ViewBag.page ;
     Temp= myobjectclass.GetAll().tolist();
      ViewBag.pages = (Temp.Count() / 5) + 1;

      var db = new ProjectContext();

      var obj = new projectClass.myobjectclass();
      if (numberpage!= null)
      {
          skip = 5 * (numberpage.Value - 1);
          ViewBag.page = numberpage.Value;

      }
      obj.StudentRequierments = Temp.Skip(skip).Take(5).ToList();
      ViewBag.pages = (Temp.Count() / 5) + 1;

      return View(obj);