ajax request to return partial view

I'm trying to make request returns on ajax updated partial view. Apparently request is not returned from the ajax-function. Here ajax-code:

<script type="text/javascript">
function doAjaxPost(myid) {
    // get the form values
    var ApplSort = $('#DropDownListSort').val();
    var radio_check_val=0;

    for (i = 0; i < document.getElementsByName('radio').length; i++) {
        if (document.getElementsByName('radio')[i].checked) {
            radio_check_val = document.getElementsByName('radio')[i].value;
        }
    }

    // alert("myid=" + myid +";"+ "ApplSort=" + ApplSort + ";" + "radio_check_val=" + radio_check_val);

    $.ajax(
 {
     type: 'POST',
     contentType: 'application/json; charset=utf-8',
     data: { ApplSort: ApplSort, radio_check_val: radio_check_val, myid: myid },
     UpdateTargetId: "tabledata",
     dataType: 'html',
     url: 'Partner/PartnerApplications',
     success: function (data) { 
      var result = data;
      $('tabledata').html(result);
},

     error: function (error) {
         alert('Ошибка AJAX-запроса. Обновите страницу!');
     }
 });
}
</script>

Fail is called and the page is completely updated.

Here's updated content in the view:

<div id="target">
@Html.Partial("~/Views/Partner/PartnerApplicationsPartial.cshtml")
</div>

controller's code:

[HttpPost]
    public ActionResult PartnerApplications(int[] ApplSort, int[] radio_check_val, int[] myid)
    {
        MordaPartner MrdPrt = new MordaPartner(Server, Request);

        if (Request.IsAjaxRequest())
        {
            var obj = MrdPrt.morda_obj.CookieAuthenticationPartner(Server, Request, Response, MrdPrt.PartnerLogin, MrdPrt.PartnerPassword);
            if (obj != null)
            {
                //alert("ApplSort=" + ApplSort + ";" + "ApplSelectOffer=" + ApplSelectOffer + ";" + "ApplSelectAuction=" + ApplSelectAuction + ";" + "ApplSelectNoOffer=" + ApplSelectNoOffer);

                var objs = from s in MrdPrt.morda_obj.entities.applications where s.application_user_city == obj.partner_city & s.application_blocked != 1 orderby s.application_id ascending select s;

                return Json(new { data = this.RenderPartialViewToString("PartnerApplicationsPartial", objs) });
            }
            else
            {
                return RedirectToAction("Registration");

            }
        }
        else { return RedirectToAction("PartnerApplications"); }
    }

RenderPartialViewToString it was taken from here: http://www.c-sharpcorner.com/blogs/7150/implementing-renderpartialviewtostring-in-asp-net-mvc-3.aspx

script is loaded:

<script src="@Url.Content("~/Scripts/jquery.unobtrusive-ajax.min.js")" type="text/javascript"></script>

What am I doing wrong?