WCF C# Tutorial

using System;
using System.Collections.Generic;
using System.Text;
using System.ServiceModel;
    [ServiceContract]
    public interface IHelloWCF
    {
        [OperationContract]
        string SayHello();
    }
    public class HelloWCFService : IHelloWCF
    {
        string WCFHelloWorldService.IHelloWCF.SayHello()
        {
            return ("Hello WCF!");
        }
    }
    class Program
    {
        static void Main(string[] args)
        {
            ServiceHost host = new ServiceHost(typeof(WCFHelloWorldService.HelloWCFService));
            host.Open();
            Console.WriteLine("running.");
            Console.WriteLine("Press  to close host.");
            Console.ReadLine();
            host.Close();
        }
    }