when exactly does the wcf autocomplete execute?

I would like to know if I have a WCF service that has a TransactionScopeRequired but I don't use a transactional binding...

Is possible to return a message fi开发者_如何学Crst and later the transaction could make a rollback?

In other workds... which executes first? the returning of the message or the commit?

Thanks in advance.

the transaction is committed when the service operation finishes executing, and before the response is returned.