exporting html table to excel is exporting whole page?

I have a html table on my page:
<table runat="Server" id="TESTTABLE">
            <tr>
                <td style="padding:0 30px 0 0;">
..................... etc etc

In my code behind then on a button click I have:
Dim filename As String = "urXlfileName.xls"
        Response.Clear()
        Response.Buffer = True
        Response.ContentType = "application/vnd.ms-excel"
        Response.AddHeader("Content-Disposition", "attachment; filename=""" & filename & """")
        Response.ContentEncoding = System.Text.Encoding.UTF7
        Response.Charset = ""
        EnableViewState = False
        Dim strWriter As New StringWriter
        Dim htmlWriter As New System.Web.UI.HtmlTextWriter(strWriter)
        CType(TESTTABLE, HtmlTable).RenderControl(htmlWriter)
        Response.Write(strWriter)

I am getting an export to excel but it is exporting the whole page rather than just the html table.

Why is this?

Thanks
scm0smlAsked:
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vbwizardryCommented:
add Response.End after Response.Write(strWriter)
Response.Write(strWriter)
Response.Flush()
Response.End()

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See if this will help.
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