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I'm new to WCF. I'm making a service in which I need to compute a lengthy operation. Since the method is lengthy I thought I could make the operation async by returning a Task. But it does not work. I'm still getting a Timeout exception. Sample code (not my actual code) demonstrating my problem below: [ServiceContract] public interface ICalculator { [OperationContract] Task<double> ComputePiAsync(ulong numDecimals); } internal class Calculator : ICalculator { public async Task<double> ComputePiAsync(ulong numDecimals) { return await SomeVeryVeryLongWayOfComputingPi(numDecimals); } } // server using (var host = new ServiceHost(typeof(Calculator), new Uri("net.pipe://localhost"))) { host.AddServiceEndpoint(typeof(ICalculator), new NetNamedPipeBinding(), "Calculator"); host.Open(); Console.WriteLine("Service is running. Press <ENTER> to exit."); Console.ReadLine(); host.Close(); } // client var factory = new ChannelFactory<ICalculator>(new NetNamedPipeBinding(), new EndpointAddress("net.pipe://localhost/Calculator")); var calculator = factory.CreateChannel(); await calculator.ComputePiAsync(numDecimals); // <--- this call takes longer than 1 minute and I'm getting a timeout here. So what should I do in order to call a lengthy operation on my service and wait for the result asynchronously ? Increase timeout ? If I increase the operation timeout, what's the point of having the method return a Task ?

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