FYI, I was trying to clean up the persisted temporary files after uploading the files to the database but the files were not being released when I tried to call DeleteAllDocuments after calling OpenStream. The correct call is as follows:

using (Stream stream = AttachmentItem.OpenStream())

{

stream.Read(byteArraydata, 0, AttachmentItem.FileSize);

}

//save to database

//call DeleteAllAttachments();

Hope this helps others...