I changed:
u.OnFileUploaded += new UploaderEventHandler(Uploader_FileUploaded)
To:
u.FileUploaded += new UploaderEventHandler(Uploader_FileUploaded)
Got new error:
'Public Event FileUploaded(sender As Object, args As CuteWebUI.UploaderEventArgs)' is an event, and cannot be called directly. Use a 'RaiseEvent' statement to raise an event.