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    <p>It should work using IsOneWay = true..</p> <p>Here is an example</p> <p>----Service Code</p> <pre><code>[ServiceContract(CallbackContract = typeof(IServerFinishedProcessingCallback), SessionMode = SessionMode.Required)] public interface IDualMathService { [OperationContract(IsOneWay=true)] void ProcessAdd(double num1, double num2); [OperationContract(IsOneWay = true)] void ProcessSubtract(double num1, double num2); [OperationContract(IsOneWay=true)] void ProcessMultiply(double num1, double num2); [OperationContract(IsOneWay=true)] void ProcessDivide(double num1, double num2); } public interface IServerFinishedProcessingCallback { [OperationContract(IsOneWay=true)] void ProcessingFinished(string operation, double result); } [ServiceBehavior(InstanceContextMode = InstanceContextMode.PerSession, ConcurrencyMode = ConcurrencyMode.Multiple)] public class DualMathServiceClass : IDualMathService { readonly IServerFinishedProcessingCallback _clientCode = OperationContext.Current.GetCallbackChannel&lt;IServerFinishedProcessingCallback&gt;(); //[PrincipalPermission()] public void ProcessAdd(double num1, double num2) { Console.WriteLine("Processing Request for client session ID " + OperationContext.Current.SessionId); Console.WriteLine(string.Format("Processing Add Request for parameters {0} and {1} ", num1, num2)); _clientCode.ProcessingFinished("Add", (num1 + num2)); } public void ProcessSubtract(double num1, double num2) { Console.WriteLine("Processing Request for client session ID " + OperationContext.Current.SessionId); Console.WriteLine(string.Format("Processing Subtract Request for parameters {0} and {1} ", num1, num2)); _clientCode.ProcessingFinished("Subtract", (num1 - num2)); } public void ProcessMultiply(double num1, double num2) { Console.WriteLine("Processing Request for client session ID " + OperationContext.Current.SessionId); Console.WriteLine(string.Format("Processing Multiply Request for parameters {0} and {1} ", num1, num2)); _clientCode.ProcessingFinished("Multiply", (num1 * num2)); } public void ProcessDivide(double num1, double num2) { Console.WriteLine("Processing Request for client session ID " + OperationContext.Current.SessionId); Console.WriteLine(string.Format("Processing Divide Request for parameters {0} and {1} ", num1, num2)); if (num2 == 0) throw new FaultException&lt;string&gt;("Number 2 can not be zer"); _clientCode.ProcessingFinished("Divide", (num1 / num2)); } } </code></pre> <hr> <p>Client Code</p> <pre><code>[CallbackBehavior(IncludeExceptionDetailInFaults = true, UseSynchronizationContext = true, ValidateMustUnderstand =true, ConcurrencyMode = ConcurrencyMode.Multiple)] public class ClientCallbackClass : IDualMathServiceCallback { public delegate void ProceFinishedEventDelegate(string operation, double result); public event ProceFinishedEventDelegate ProcessFinishedEvent = null; public void ProcessingFinished(string operation, double result) { if (ProcessFinishedEvent != null) { ProcessFinishedEvent(operation, result); } } } </code></pre>
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