Multiple Fileuploads In One Web Page?

I have a number of web pages that upload files as blob objects, all working fine.

I've come to a page, where I need to upload different types of files for different reasons - all on one page.

I've cut out all the HTML to make this easier to understand what i'm doing..

Code:
<form id="Form1" method="post" runat="server" enctype="multipart/form-data" action="UploadPhoto.aspx">
<asp:FileUpload ID="FileUpload1" runat="server" style='width:450px'/>
<asp:button id="btnUpload" style='margin-top:10px;' type="submit" text="Upload & Attach" runat="server"></asp:button>
</form>

Now, in the code page, I can capture the button click with..

Code:
Protected Sub btnUpload_Click(sender As Object, e As System.EventArgs) Handles btnUpload.Click
If FileUpload1.HasFile Then
Dim name As String = FileUpload1.PostedFile.FileName
Dim Justname As String = Path.GetFileName(name)

[Code] .....

All works well... Now, I want to have a few input boxes for uploading different files.

Code:

<form id="Form1" method="post" runat="server" enctype="multipart/form-data" action="UploadPhoto.aspx">
<table >
<tr>
<td>Thumb Image:</td>
<td>
<asp:FileUpload ID="FileUpload3" runat="server" style='width:450px'/>

[Code] ....

But the button events on the code page aren't executing?? Page flashes and nothing happens. - Also tried writing out

Code:
for each item as string in request.form
response.write(item & " = ")
response.write(request(item) & " <br> ")
next

Again, nothing is being sent?