web service custom exceptions?

[Walter Sobchak]

I was given a wsdl file from witch I generated server interface code to
write a web service.
Anyway faults in the wsdl are ignored by .net so my generated code
doesn't have their definitions.

How can I throw a custom exception defined in that wsdl?
Can I do it through creating a new SoapException with some parameters or
is there another way?

Thanks in advance for any suggestions.