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Problems Using an XML Web Service that Returns a DataTable
KB: 306134
When you browse to the URL of an XML Web service that returns a DataTable from one of its Web methods, you may receive the following error message:

System.Data.DataRelation cannot be serialized because it does not have a default public constructor.

You may also see an error message similar to the following when you try to set a Web reference to this XML Web service in the Visual Studio .NET integrated development environment (IDE):

Internal Server Error. Unable to request "http://localhost/Webservice1/Service1.asmx?WSDL". The server responded with error code "ProtocolError".

The DataTable, DataRow, DataView, and DataViewManager objects cannot be serialized and cannot be returned from an XML Web service. To return less than a complete DataSet, you must copy the data that you want to return to a new DataSet.
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