I took it for granted that because .NET web service client sends SOAP request to invoke web service method, the client side should use SoapFormatter to serialize SOAP request parameters. Today I know I was wrong.
Actually the client side uses XMLSerializer (instead of SOAPFormatter) to serialize SOAP request content.
Why? Because SOAPFormatter (or BinaryFormatter) serializes all public, private data members and even methods to a stream, while XMLSerializer only serializes public data members. Web service is supposed to integrate separate applications in different platform (.Net, or Java, etc.), so it does not make sense to send private members and methods to the other side.
If you want to send the whole object to the other side, you should use .NET remoting where you can make use of SOAPFormatter or BinaryFormatter.
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