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copied!<p>Solved!</p> <p>I can't return String, I have return Greeting object to the client.</p> <pre><code>using System; using System.ServiceModel; using System.Net.Security; namespace com.blogspot.jeanjmichel.model { [MessageContract] public class Greeting { private String userGreeting; private void SetGreeting() { DateTime now = DateTime.Now; if (now.Hour >= 7 && now.Hour <= 11) { this.userGreeting = "Good morning"; } else if (now.Hour >= 12 && now.Hour <= 17) { if (now.Hour == 12 || now.Hour == 13) { this.userGreeting = "Good afternoon, it's lunch time!"; } else { this.userGreeting = "Good afternoon"; } } else if (now.Hour >= 18 && now.Hour <= 20) { this.userGreeting = "Good evening"; } else { this.userGreeting = "Good night"; } } [MessageBodyMember(Order = 1, ProtectionLevel = ProtectionLevel.EncryptAndSign)] public String UserGreeting { get { return this.userGreeting; } } public Greeting() { this.SetGreeting(); } } } using System; using System.ServiceModel; using com.blogspot.jeanjmichel.model; namespace com.blogspot.jeanjmichel.services.contract { [ServiceContract(Namespace = "http://jeanjmichel.blogspot.com/services/v0.0.1")] public interface IGetGreeting { [OperationContract] Greeting GetGreeting(Credential credential); } } using System; using System.ServiceModel; using com.blogspot.jeanjmichel.services.contract; using com.blogspot.jeanjmichel.model; namespace com.blogspot.jeanjmichel.services { [ServiceBehavior(InstanceContextMode = InstanceContextMode.PerCall, Namespace = "http://jeanjmichel.blogspot.com/services/v0.0.1")] public class GetGreetingService: IGetGreeting { public Greeting GetGreeting(Credential credential) { if (String.IsNullOrEmpty(credential.Token)) { throw new FaultException("Inform the security phrase, and try again."); } else { if (credential.Token.Equals("mySeCuriTyP@ss")) { Greeting g = new Greeting(); return g; } else { throw new FaultException("Wrong password."); } } } } } </code></pre>

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