Problem with partial-page refresh with AJAX AsyncFileUpload in VB.NET

I am trying to use AJAX AsyncFileUpload to upload image files to the server. When the image file is uploaded, I want it to immediately appear on the page.

My image to refresh is called "frenchlogo". When the upload event fires, it calls a subroutine AsyncFileUpload2_UploadedComplete which checks and saves the file, and updates the source of the image (frenchlogo.ImageUrl).

The Asyncfileupload and image are in the same Updatepanel.

What am I doing wrong ?

Thanks, Peter

Protected Sub AsyncFileUpload2_UploadedComplete(ByVal sender As Object, ByVal e As AjaxControlToolkit.AsyncFileUploadEventArgs)
If AsyncFileUpload2.HasFile then
    ' Determine new file name
    fileExtension = System.IO.Path.GetExtension(AsyncFileUpload2.Filename).ToLower()
    newfilename = "flogo-" & Session("sponsor") & fileExtension
    FolderToSave = Server.MapPath("\") & "Userdata\L-" & Trim(Session("Leaguenum")) & "\Advertisement\"

    ' Validate file is of correct type
    fileOK = False
    Dim allowedExtensions As String() = {".jpg", ".jpeg", ".png", ".gif"}
    For i As Integer = 0 To allowedExtensions.Length - 1
        If fileExtension = allowedExtensions(i) Then
            fileOK = True
        End If
    Next
        
    ' Save the file    
    If fileOK Then
        Try
            AsyncFileUpload2.PostedFile.SaveAs(trim(FolderToSave & newfilename))
            Outputmessage = "File uploaded!"
        Catch ex As Exception
            Outputmessage = "File could not be uploaded."
        End Try
    Else
        Outputmessage = "Cannot accept files of this type."
    End If

    ' Update database entry to indicate new banner name
        cmd.Connection = MyConn
        cmd.Connection.Open()     
        cmd.CommandText = "Update sponsors set sponsorlogofr = '" & newfilename & "' where sponsorid = " & Session("sponsor")
        cmd.ExecuteNonQuery()
        cmd.Connection.Close()

    ' Display the output message
    upload2Label.Text = Outputmessage

   End if

frenchlogo.ImageUrl = Foldertosave & newfilename
Showfrenchlogoimages.Visible = "true"

End Sub


<asp:UpdatePanel ID="UpdatePanel1" runat="server">
    <ContentTemplate>
        <asp:Panel ID="Showfrenchlogoupload" runat="server">
            <tr>
                <td style="padding-left: 15px">
                    <ajaxToolkit:AsyncFileUpload runat="server" ID="AsyncFileUpload2" Width="400px"
	                    UploaderStyle="Modern" UploadingBackColor="#CCFFFF" ThrobberID="Throbber2"
	                    OnUploadedComplete="AsyncFileUpload2_UploadedComplete" />

                    <asp:Label runat="server" ID="Throbber2" Style="display: none;">
                        <img align="absmiddle" alt="" src="~/images/ajax-loader.gif" />
                    </asp:Label>
                    <br /><asp:Label id="upload2Label" runat="server" />
                </td>
            </tr>
        </asp:Panel>
        <asp:Panel ID="Showfrenchlogoimages" runat="server">
            <tr>
                <td align="center">
                    <asp:Image ID="frenchlogo" runat="server" />
                </td>
            </tr>
            <tr>
                <td>
                    <asp:Button ID="Button4" Text="Change Logo" runat="server" OnCommand="ChangeAd"
                        CommandName="frenchlogo" />
                </td>
            </tr>
        </asp:Panel>
    </ContentTemplate>
</asp:UpdatePanel>

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