WCF server method - returning DataSet kills output parameters?

WCF, as defined by SOA, must not transport an object (state and behavior), only the state and strucuture of an object. BinaryFormatter, and SoapFormatter are inadequate for SOA because: 1) Requires both ends to share type 2) cannot be used for contracts 3) both formatters require streams.

I had XmlSerializerFormat at the top of my contract interface. Removing it fixed the problem, as WCF starts using the default DataSerializerFormat. Thanks Darin for point it out.

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