I have a similar issue with evaluation.  I'm looking at the code for on multiple-files-upload.aspx (shown below):

 

  void ButtonTellme_Click(object sender, EventArgs e)
    {
        ListBoxEvents.Items.Clear();
        foreach (AttachmentItem item in Attachments1.Items)
        {
            InsertMsg(item.FileName + ", " + item.FileSize + " bytes.");
            //Copies the uploaded file to a new location.
            //args.CopyTo("c:""temp"""+item.FileName);

            //You can also open the uploaded file's data stream.
            //System.IO.Stream data = item.OpenStream();
        }