[ServiceContract]
    public interface IService1
    {
        [OperationContract]
        [WebGet(ResponseFormat = WebMessageFormat.Json)]
        string DoWork();
    }

 [ServiceBehavior(InstanceContextMode = InstanceContextMode.PerCall)]
    public class Service1 : IService1
    {
        public string DoWork()
        {
            Console.WriteLine(0);
            return "1";
        }
    }

 static void Main(string[] args)
        {
            WebServiceHost host = new WebServiceHost(typeof(Service1), new Uri("http://localhost:8182/"));
            host.Open();

            while (true)
            {
                Console.ReadLine();
            }
        }