File Upload weirdness...

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Ok,

So, I'm a .NET/AJAX web application (VB.NET) and in one of my content screens, among a barrage of controls and panels, I have a File Upload control... nothing fancy.
Below the control there is a standard button called aFile_btn.

This is the click event of aFile_btn:
---------------------------------------------------------------
Protected Sub aFile_btn_Click(ByVal sender As Object, ByVal e As System.EventArgs)
If FileUpload1.PostedFile.FileName <> "" Then
End If
End Sub
--------------------------------------------------------------

Simple? I thought so. But when I run the app and click aFile_btn I get the following error on the "If" line:

Object reference not set to an instance of an object.

You think that's frustrating? there's more. If I copy and paste the exact code behind the button onto a fresh page, with only a FileUpload control and a Button, it works perfectly...........

Any ideas?

.

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