I have the need to specifically set the file name to something different than the original and retain the extension. See my code:

Protected Sub AJAXUploader1_FileUploaded(ByVal sender As Object, ByVal e As System.EventArgs) Handles AJAXUploader1.FileUploaded
Dim file As EO.Web.AJAXPostedFile

For Each file In Me.AJAXUploader1.PostedFiles
Dim tempFileName As String = file.TempFileName

Dim finalFileName As String = "SessionCSID." & Right(file.FullClientFileName, 3)

System.IO.File.Move(file.TempFileName, finalFileName)

Next
End Sub

If seems to be failing because if doesnt set a TempFileName
That value is coming up as a NULL

suggestions?