Microsoft® Mobile Development Handbook

Using Web Services for Data Synchronization

When you add a Web reference to your client-side application project, the Visual Studio Add Web Reference tool generates a proxy class that includes methods that make it easy to make calls to the Web service, receive the response, and make the received data available to your application. When Visual Studio detects that the Web service returns a strongly typed DataSet object, it generates code in the proxy class that creates an instance of that strongly typed DataSet as the return value for the proxy class method that calls the Web method.

In .NET Compact Framework 1.0, the tool-generated code for a Web service that uses strongly typed DataSet objects requires classes that are not supported by the runtime ...