InfoPath Dev

I have an InfoPath invoice payment form that submits payment specification data to a Microsft SQL database via a data connection.  I want the user to be able to be able to sign and submit the form at the same time.  How can I get the form to be submitted automatically when the user clicks the signature section to sign the form?   

You'll have to write code to do that and use the OnSign event handler or Sign method to programmatically do this via another button click.