Export to excel not working in popup window in asp.net

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C#

ASP.NET

Hello everyone,

I have made an application in asp.net in which on click of gridview template field a javascript is called and from that javascript a new popup window is opened(not modal popup window), i have button in that popup window on click of which i have a function of exporting data to excel..everything works fine but the excel is not viewed as downloaded...

Please help here is my code..

protected void btmExport_Click(object sender, EventArgs e)
    {
        //Response.Redirect("DownloadComplaintsExcel.aspx");
        DataSet ds = (DataSet)ViewState["ComplaintDataSet"];
        ExportDetails(ds.Tables[0]);
    }
 public void ExportDetails(DataTable dt)
    {
        string fileName = "Complaints-" + DateTime.Today.Day.ToString() + "" + DateTime.Today.Month.ToString() + "" + DateTime.Today.Year.ToString();
        HttpResponse response = HttpContext.Current.Response;
        response.Clear();
        response.ContentType = "application/vnd.ms-excel";
        response.AddHeader("Content-Disposition", "attachment;filename=\"" + fileName + "\".xls");
       
        StringWriter sw = new StringWriter();
        HtmlTextWriter htw = new HtmlTextWriter(sw);
        DataGrid dg = new DataGrid();
        dg.DataSource = dt;
        dg.DataBind();
        dg.RenderControl(htw);
        response.Write(sw.ToString());
        response.End();
    }

Please help..

Regards,
Krunal