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I am trying to make a WCF REST method entirely asynchronous (I don't want to block anywhere). Essentially I have a simple service with 3 layers: Service, Business Logic and Data Access Layer. The Data Access Layer is accessing a database and it can take several second to get a response back from that method. I don't understand very well how to chaining of all those method work. Can someone please help me to complete the sample I am trying to write below? I don't understand well the pattern used by WCF and I didn't find much documentation on the subject. Can someone help me to complete the following example? In addition, how can I measure that the service will be able to handle more load than a typical synchronous implementation? using System; using System.Collections.Generic; using System.Runtime.Remoting.Messaging; using System.ServiceModel; using System.ServiceModel.Activation; using System.ServiceModel.Web; using System.Threading.Tasks; namespace WcfRestService1 { [ServiceContract] [AspNetCompatibilityRequirements(RequirementsMode = AspNetCompatibilityRequirementsMode.Allowed)] [ServiceBehavior(InstanceContextMode = InstanceContextMode.PerCall)] public class Service1 { private BusinessLogic bll = new BusinessLogic(); // Synchronous version [WebGet(UriTemplate = "/sync")] public string GetSamples() { return bll.ComputeData(); } // Asynchronous version - Begin [WebGet(UriTemplate = "/async")] [OperationContract(AsyncPattern = true)] public IAsyncResult BeginGetSampleAsync(AsyncCallback callback, object state) { Task<string> t = bll.ComputeDataAsync(); // What am I suppose to return here // return t.AsyncState; ??? } // Asynchronous version - End public List<SampleItem> EndGetSampleAsync(IAsyncResult result)

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