In my mvc application I am passing data using session from Index ActionMethod to ExportToExcel ActionMethod, which is not very efficient when playing with large amount of data and slowed down my application very much. How do I pass my search data from one actionmethod to another. Below is the code I am working with.

public class APPET1Controller : Controller
{
   private APContext db = new APContext();

// GET: APPET1
public ActionResult Index(string search, string cagecode, string sortBy, 
                          int? page, string docNumber, string remark, string status)
{
    APPETViewModel viewModel = new APPETViewModel();

    var aPPET1 = db.APPET1.Include(t =>T.APPETMedia)
                                .Include(t => t.Status)
                                .Include(t => t.APPETCCode)
                                .Include(t => t.APPETDType);
             ............some more codes..............

    DateTime searchDate;
    if (!String.IsNullOrEmpty(search))
    {
        bool isDateSearch = DateTime.TryParse(search, out searchDate);
        if (isDateSearch)
        {
            aPPET1 = aPPET1.Where(s => s.Date_Received == searchDate);
        }

        else
        {
            aPPET1 = aPPET1.Where(t.Doc_Number.Contains(search)
                    || t.Status.Status1.Contains(search)
                    || t.Remark.Contains(search)
                    || t.CCode.Contains(search));
         ..............some more codes..............
           viewModel.Search = search;
        }

    }
  var stats = db.Status.Select(s => s.Status1);
    viewModel.Statuses = new SelectList(stats);
    {

      if (!String.IsNullOrEmpty(status))
      {
        aPPET1 = aPPET1.Where(t => t.Status.Status1.Contains(status));
      }
    }
    if (!String.IsNullOrEmpty(docNumber))
    {   
        aPPET1 = aPPET1.Where(t => t.Doc_Number.Contains(docNumber));
    }
    if (!String.IsNullOrEmpty(remark))
    {
        aPPET1 = aPPET1.Where(t => t.Remark.Contains(remark));
    }
 ............some more codes.........

    Session["SearchResults"] = aPPET.ToList<APPET>();
    return View(viewModel);

}

public ActionResult ExportToExcel()
        {
var AppetList= (List<APPET1>)Session["SearchResults"];
            var result = from r in AppetList
                         select new
                         {
                             DocNumber = r.DocNum,
                             Status = r.Status.Status1,
                             Remark = r.Remark
                       -----some more codes------

                         };
            GridView gv = new GridView();
            gv.DataSource = result.ToList();
            gv.DataBind();
            Response.ClearContent();
            Response.Buffer = true;
            Response.AddHeader("content-disposition", "attachment; filename=TaciList.xls");
            Response.ContentType = "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet";
            Response.Charset = "";
            StringWriter sw = new StringWriter();
            HtmlTextWriter htw = new HtmlTextWriter(sw);
            gv.RenderControl(htw);
            Response.Output.Write(sw.ToString());
            Response.Flush();
            Response.End();

            return RedirectToAction("Index");

Any help, guidance, referrence will be greatly appreciated. Thank you