.NET 2.0 Web服务WSDL错误元素被忽略？

I have a web service method where I would like to throw some custom exceptions e.g. SomeException, SomeOtherException etc which the web service would then turn into a SOAP fault which the client would be able to handle. In Java I can have wsdl:fault elements within the wsdl:operation element in the WSDL. It appears it .NET that this is not catered for and that there is no way of putting attributes on a WebMethod to show what SOAP faults may occur.I have a web service method where I would like