Exporting Data Table to Excel

System.Web.UI.WebControls.DataGrid dg =  new System.Web.UI.WebControls.DataGrid;
        try
        {
            Response.Clear();
            Response.ClearContent();
            Response.ClearHeaders();
            Response.Charset = "";
            Response.ContentType = "application/vnd.ms-excel";
            Response.AddHeader("Content-Disposition", "attachment;filename=ExportFile.xls");
            EnableViewState = true;
            System.IO.StringWriter stringWrite = new System.IO.StringWriter();
            System.Web.UI.HtmlTextWriter htmlWrite = new System.Web.UI.HtmlTextWriter(stringWrite);
            dg = new System.Web.UI.WebControls.DataGrid();
            dg.DataSource = ds;
            dg.DataBind();
            dg.RenderControl(htmlWrite);
            Response.Write(stringWrite.ToString());
            Response.End();
        }
        catch (Exception ex)
        {
            Response.Write(ex.Message);
        }
        finally
        {
        }