Sumbit error in infopath 2007

[will]

I am using c# code to customise submit function in infopath 2007. Infopath
successully called a webservice function and update my database. However the
return status is always false, given the error message below:

The onSubmitRequest event handler returned a value indicating that the
submit failed.

However there's no place for me to indicate this submission is successful.
In infopath 2003 we could say e.ReturnStatus = true; in infopath 2007, how
could we achieve this?

Thanks