Download Report to Execl in asp.net MVC4

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ASP.NET

MVC4

hi,
iam downloading my data from sql server to execl. when i was try to open Execl file it shows
Error message with options(yes,No,Cancel):
The file you are trying to open "DetailedPurchases.xls" in a different format than specified file extension. Verify that the file is not corrupted and is from a trusted source before opening the file. Do you want to open the file now?
when i click yes , file opens but with white back ground( no columns). it opens fine in OpenOffice

here is my code in Controller:

  List<TicketReportsModel> Obj= GetDetailedTicketPurchases(Id);
// using this iam getting data from my stored procedure to Obj

System.Web.UI.WebControls.GridView gridvw = new System.Web.UI.WebControls.GridView();
           gridvw.DataSource = Obj.ToList(); // binding data
           gridvw.DataBind();
           Response.ClearContent();
           Response.AddHeader("content-disposition",                    "attachment;filename=Detailed_Ticket.xls");
           Response.ContentType = "application/vnd.ms-excel";
           StringWriter swr = new StringWriter();
           HtmlTextWriter tw = new HtmlTextWriter(swr);
           gridvw.RenderControl(tw);
           Response.Write(swr.ToString());
           Response.End();

 i tried by changing
     Response.ContentType = "application/excel";

plz help me to find this. thanks in advance