How to export list to excel if the list has a list property

public class Results
{
     List<string>name{get;set;}
     List<string>phone{get;set;}
     public string id {get;set;}
 }

List<Results> lst = new List<Results>();

[HttpPost]
   public ActionResult ShowResult()
   {

       GridView gv = new GridView();
       List<SearchResults> lst = (List<SearchResults>)TempData["lst"];
       gv.DataSource = lst;
       gv.DataBind();
       Response.ClearContent();
       Response.Buffer = true;
       Response.AddHeader("content-disposition",       "attachment;filename=Marklist.xls");
       Response.ContentType = "application/ms-excel";
       Response.Charset = "";
       StringWriter sw = new StringWriter();
       HtmlTextWriter htw = new HtmlTextWriter(sw);
       gv.RenderControl(htw);
       Response.Output.Write(sw.ToString());
       Response.Flush();
       Response.End();
       return View(model);
   }