store excel in folder on button event without save option?

Question

how to generate excel from dataset and store it in folder without save option?

i am using below but it asked for the  save option.

  ds = new DataSet();

        ds = sq.ExecuteDataSet("Filllresult1", param);

        if ((ds != null) && (ds.Tables.Count != 0) && (ds.Tables[0].Rows.Count != 0))

        {

           

            HttpResponse response = HttpContext.Current.Response;

            response.Clear();

            //response.Charset = "";

            response.ContentType = "application/vnd.ms-excel";

            response.AddHeader("Content-Disposition", "attachment;filename=Smarks.xls");

            //string filename = "Mark" + p; 

            //response.AddHeader("Content-Disposition", "C:\"" + fileName + "\"");

            StringWriter sw = new StringWriter();

            HtmlTextWriter htw = new HtmlTextWriter(sw);

            DataGrid dg = new DataGrid();

            dg.DataSource = ds;

            dg.DataBind();

            dg.RenderControl(htw);

            response.Write(sw.ToString());

            response.End();

        }