C# Export DataSet to Excel

    public void ExportDataSetToExcel(DataSet ds, string filename)
    {
        HttpResponse response = HttpContext.Current.Response;
        // first let's clean up the response.object
        response.Clear();
        response.Charset = "";
          
        // set the response mime type for excel
        response.ContentType = "application/vnd.ms-excel";
        response.AddHeader("Content-Disposition", "attachment;filename=\"" + filename + "\"");
          
        // create a string writer
        using (StringWriter sw = new StringWriter())
        {
            using (HtmlTextWriter htw = new HtmlTextWriter(sw))
            {
                // instantiate a datagrid
                DataGrid dg = new DataGrid();
                dg.DataSource = ds.Tables[0];
                dg.DataBind();
                dg.RenderControl(htw);
                response.Write(sw.ToString());
                response.End();
            }
        }
    }