<ServiceContract()> _
Public Interface ICalculator
    <OperationContract()> _
    <WebInvoke(UriTemplate:="add?x={x}&y={y}")> _
    Function Add(ByVal x As Long, ByVal y As Long) As Long

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

    <OperationContract()> _
    <WebInvoke(UriTemplate:="mult?x={x}&y={y}")> _
    Function Multiply(ByVal x As Long, ByVal y As Long) As Long

    <OperationContract()> _
    <WebInvoke(UriTemplate:="div?x={x}&y={y}")> _
    Function Divide(ByVal x As Long, ByVal y As Long) As Long

    <OperationContract()> _
    <WebGet(UriTemplate:="hello?name={name}")> _
    Function SayHello(ByVal name As String) As String
End Interface

Public Class CalcService
    Implements ICalculator
    Public Function Add(ByVal x As Long, ByVal y As Long) As Long Implements ICalculator.Add
        Return x + y
    End Function

    Public Function Subtract(ByVal x As Long, ByVal y As Long) As Long Implements ICalculator.Subtract
        Return x - y
    End Function

    Public Function Multiply(ByVal x As Long, ByVal y As Long) As Long Implements ICalculator.Multiply
        Return x * y
    End Function

    Public Function Divide(ByVal x As Long, ByVal y As Long) As Long Implements ICalculator.Divide
        Return x / y
    End Function

    Public Function SayHello(ByVal name As String) As String Implements ICalculator.SayHello
        Return "Hello " + name
    End Function
End Class

[ServiceContract]
public interface ICalculator
{
    [OperationContract]
    [WebInvoke(UriTemplate = "add?x={x}&y={y}")]
    long Add(long x, long y);

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

    [OperationContract]
    [WebInvoke(UriTemplate = "mult?x={x}&y={y}")]
    long Multiply(long x, long y);

    [OperationContract]
    [WebInvoke(UriTemplate = "div?x={x}&y={y}")]
    long Divide(long x, long y);

    [OperationContract]
    [WebGet(UriTemplate = "hello?name={name}")]
    string SayHello(string name);
}

public class CalcService : ICalculator
{
    public long Add(long x, long y)
    {
        return x + y;
    }

    public long Subtract(long x, long y)
    {
        return x - y;
    }

    public long Multiply(long x, long y)
    {
        return x * y;
    }

    public long Divide(long x, long y)
    {
        return x / y;
    }

    public string SayHello(string name)
    {
        return "Hello " + name;
    }
}

class Program
{
    static void Main(string[] args)
    {
        Uri baseAddress = new Uri("http://localhost:8000/");

        WebServiceHost svcHost = new WebServiceHost(typeof(CalcService), baseAddress);

        try
        {
            svcHost.Open();

            Console.WriteLine("Service is running");
            Console.WriteLine("Press enter to quit...");
            Console.ReadLine();

            svcHost.Close();
        }
        catch (CommunicationException cex)
        {
            Console.WriteLine("An exception occurred: {0}", cex.Message);
            svcHost.Abort();
        }
    }
}