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WCF Hello World Service

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 <enter> to close host.");             Console.ReadLine();             host.Close();         }     }