Custom filter methods in LINQ statement

   I'm building out a PersitenceService as per the example in the PrismExplorer.

I have a query that looks like this:

   query = Manager.People

          .Where(p => p.LastName.ContainsAny("smith bell", " "));

The 'ContainsAny' is my own extension method.  DevForce is throwing errors saying it can't find it, which makes sense as it's probably not the same assembly name on the server.  An alternative I tried was putting this 'ContainsAny' as a static method on the [Person] object itself, which IS shared between the SL client and the server.

This then caused DevForce to throw an Linq exception saying it could not execute the method.

So my question is, what is the approach for calling out to custom filter routines within a LINQ statement?

Thanks!

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Phil