<ServiceContract()> _
Public Interface ICalculator
    <OperationContract()> _
    <WebGet()> _
    Function Add(ByVal x As Long, ByVal y As Long) As Long

    <OperationContract()> _
    <WebGet(UriTemplate:="Sub?x={x}&y={y}")> _
    Function Subtract(ByVal x As Long, ByVal y As Long) As Long

    <OperationContract()> _
    <WebGet(UriTemplate:="Mult?x={x}&y={y}", BodyStyle:=WebMessageBodyStyle.Bare)> _
    Function Multiply(ByVal x As Long, ByVal y As Long) As Long

    <OperationContract()> _
    <WebGet(UriTemplate:="Div?x={x}&y={y}", RequestFormat:=WebMessageFormat.Xml)> _
    Function Divide(ByVal x As Long, ByVal y As Long) As Long

    <OperationContract()> _
    <WebGet(ResponseFormat:=WebMessageFormat.Json)> _
    Function Modulo(ByVal x As Long, ByVal y As Long) As Long
End Interface

[ServiceContract]
public interface ICalculator
{
    [OperationContract]
    [WebGet]
    long Add(long x, long y);

    [OperationContract]
    [WebGet(UriTemplate = "Sub?x={x}&y={y}")]
    long Subtract(long x, long y);

    [OperationContract]
    [WebGet(UriTemplate = "Mult?x={x}&y={y}", BodyStyle = WebMessageBodyStyle.Bare)]
    long Multiply(long x, long y);

    [OperationContract]
    [WebGet(UriTemplate = "Div?x={x}&y={y}", RequestFormat = WebMessageFormat.Xml)]
    long Divide(long x, long y);

    [OperationContract]
    [WebGet(ResponseFormat= WebMessageFormat.Json)]
    long Mod(long x, long y);
}