Here's the scenario: You are writing an NetCF app and trying to call a web service from that app. You generated the code for the client proxy class using Visual Studio's "Add Web Reference" command. Code is generated, you call into it, and you run your app. The call fails with a cryptic error from the web service saying something about a malformed message. If you try the same thing from a desktop app it works perfectly. Sound familiar? Read on for the reason and solution.

I'll address the common cause of xml element mis-ordering here.