Passing an optional parameter to a webservice in vb.net

Is there a way to pass an optional parameter to a webservice, instead of having to overload the method?

If the webservice user is accessing the webservice directly, I want to do ActionA, if the user is accessing the webservice through my web interface, I want to do Action开发者_StackOverflowA + ActionB.

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no, you can't really have optional params for a service.

Even if an input parameter for a Web service method is optional, you must still include it and set the parameter value to null

Supplying Web Service Method Arguments

So, its optional to a degree, that you dont have to supply a value, but you're still going to have to write null instead. Overloading is the 'normal' way to do this.