<ServiceContract(), XmlSerializerFormat(Style := OperationFormatStyle.Rpc, _
Use := OperationFormatUse.Encoded)> _
Public Interface ICalculator
<OperationContract(), XmlSerializerFormat(Style := OperationFormatStyle.Rpc, _
Use := OperationFormatUse.Encoded)> _
Function Add(ByVal a As Double, ByVal b As Double) As Double
End Interface