ways to expose a class of a web service

[Ghost]

I WOULD LIKE TO KNOW THE WAYS THAT A CLASS IS EXPOSED TO A WEB CLIENT.

 

Is it that only if there is a web method that either returns or acceots an instance / object of that class, only then the class is exposed? is there no other way i can expose a class defined in a web service to the client.

 

I have an Exception class that wraps any exception given by the web service and throws it back to the client. But i want the client to be able to access that clas so that it can cach that exception. How can i do this?