Export Excel Problema

[mexican]

Ciao a tutti, ho un problema con un export in excel. Di seguito il codice:

response.Clear()
        response.Charset = ""
        response.ContentType = "application/vnd.xls"
        response.AddHeader("Content-Disposition", "attachment;filename=" & nomeExport.Replace(" ", "_") & "_" & String.Format("{0:yyyyddMMhhmmss}", DateTime.Now) & ".xls")
        response.ContentEncoding = System.Text.Encoding.UTF8
        Dim stringWrite As New System.IO.StringWriter
        'create an htmltextwriter which uses the stringwriter
        Dim htmlWrite As New System.Web.UI.HtmlTextWriter(stringWrite)
        htmlWrite.Write("<table><td colspan=""" & Tbl.Columns.Count & """><h2>" & nomeExport & " (" & Format(Date.Now(), "dd/MM/yyyy") & ") Operatore: " & SicOperatore.OperatoreValidatoUsername & "</h2></td></table>")
        'instantiate a datagrid
        Dim dg As New System.Web.UI.WebControls.DataGrid
        dg.DataSource = Tbl
        dg.DataBind()
        dg.RenderControl(htmlWrite)
        response.Write(stringWrite.ToString)
        Audit.Registra(nomeExport & " in Excel")
        response.End()

Quando si apre Excel non si carica niente resta una pagina vuota.