Hi experts i am listing data using a List

this sort my data but page load the data table in empty layout (no master layout with navigation menus and rest.)

below table heading actionlink

   <td class="mylisttableheader">@Html.ActionLink("Name", "SortSites", new {sortOrder = ViewBag.NameSortParm })</td>


  @foreach (var item in list)
                {
                    <tr>
                        <td>@item.name </td>
                        <td>@item.shortname</td>

in my surfacecontroller

      [HttpGet]
            public ActionResult SortSites(string sortOrder)
            {

                TempData["result"] = "No sites";
                try
                {
                    var m = Membership.GetUser();
                    if (m != null)
                    {
                        bool getdata = false;
                        var list = new List<myCodeProject.Models.SiteModel>();
                        ViewBag.NameSortParm = String.IsNullOrEmpty(sortOrder) ? "name_desc" : "";
                        ViewBag.SNameSortParm = sortOrder == "shortname" ? "shortname_desc" : "shortname";

                        if (ViewBag.sites != null)
                        {
                            list = (List<myCodeProject.Models.SiteModel>)ViewBag.sites;
                            getdata = true;
                        }
                        else
                        {

                            string myaccountid = "";
                            string mycontactid = "";  

//    generate instance of ms1
                            _myContact myc = ms1.check_email_on_login(m.Email, myHelper.read_request_key());
                            if (myc.isValid_result)
                            {

                                myaccountid = myc.parentaccountid;
                                mycontactid = myc.contactid;
                                _summaryAccount[] sitelist = ms1.list_sites_for_customer(myaccountid, mycontactid);

                                if (sitelist != null)
                                {
                                    foreach (_summaryAccount a in sitelist)
                                    {
                                        var s = new SiteModel();
                                        s.name = a.name;
                                        s.shortname = a.shortname;
                                        s.address1_line1 = a.address1_line1;
                                        s.address1_line2 = a.address1_line2;
                                        s.address1_city = a.address1_city;
                                        s.address1_county = a.address1_county;
                                        s.address1_postalcode = a.address1_postalcode;
                                        s.accountid = a.id;
                                        s.parentSite = a.parentidname;
                                        s.primarycontact = a.primarycontactidname;
                                        s.parentSiteid = a.parentid;

                                        list.Add(s);
                                    }

                                    TempData["result"] = "found sites";

                                    getdata = true;
                                   // ViewBag.sites = list;

                                }

                            }

                        }

                        if (getdata)
                        {
                            switch(sortOrder)
                            {
                                case "name_desc":

                                    ViewBag.sites = list.OrderByDescending(x => x.name ).ToList<SiteModel>();
                                    break;
                                case "shortname":
                                    ViewBag.sites = list.OrderBy(x => x.shortname).ToList<SiteModel>();
                                    break;
                                case "shortname_desc":
                                    ViewBag.sites = list.OrderByDescending(x => x.shortname).ToList<SiteModel>();
                                    break;
                                default:
                                    ViewBag.sites = list.OrderBy(x => x.name).ToList<SiteModel>();
                                    break;
                            }
                        }

                    }//if member logged in 
                }
                catch (Exception ex)
                {


                }


                return  PartialView("~/Views/Partials/ListSites.cshtml", new SiteModel());



            }

this return sorted data but I lost the master templates of my web site .... how to sort this please