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If you look into the message, we can find that DataTable is not serializable. End of inner exception stack trace -Īt .Serialize(TextWriter textWriter, Object o, XmlSerializerNamespaces namespaces)Īt .Serialize(TextWriter textWriter, Object o)Īt .XmlReturnWriter.Write(HttpResponse response, Stream outputStream, Object returnValue)Īt .HttpServerProtocol.WriteReturns(Object returnValues, Stream outputStream)Īt .WebServiceHandler.WriteReturns(Object returnValues)Īt .WebServiceHandler.Invoke()" at (XmlWriter writer, Boolean writeHierarchy)Īt .(XmlWriter writer)Īt .WriteSerializable(IXmlSerializable serializable, String name, String ns, Boolean isNullable, Boolean wrapped)Īt .XmlSerializationWriter1.Write1_DataTable(Object o)Īt .DataTableSerializer.Serialize(Object objectToSerialize, XmlSerializationWriter writer)Īt .Serialize(XmlWriter xmlWriter, Object o, XmlSerializerNamespaces namespaces, String encodingStyle, String id) > System.InvalidOperationException: Cannot serialize the DataTable. "System.InvalidOperationException: There was an error generating the XML document. If you try, ends up with the following message No, You can't return a DataTable object from a webservice method.