Further reading indicates that it is not possible to use a Stream object in a SL4-to-WCF contract.
http://blogs.msdn.com/b/carlosfigueira/archive/2010/07/08/using-transfermode -streamedresponse-to-download-files-in-silverlight-4.aspx I created a test method in my service for experiments and I find that the proxy generator converts a Stream into a byte[]. The link above uses a ChannelFactory to hack in at the Message level and simulate streaming at a low level. It all looks like a fragile mess to me. So now I'm even more puzzled than when I started. Greg
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