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InstanceContextMode.Single with basicHttpBinding

Posted By:      Posted Date: September 24, 2010    Points: 0   Category :WCF


it is known that basicHttpBinding does not support sessions. However, when i configure a service as InstanceContextMode.Single and use basicHttpBinding it seems the service still creates only a single object although no session id is returned. please see the below example:

[ServiceBehavior(InstanceContextMode=InstanceContextMode.Single, ConcurrencyMode=ConcurrencyMode.Multiple)]
public class Service : IService

Guid guid = Guid.NewGuid();
public string GetData()

return guid.ToString() +";;;" + OperationContext.Current.SessionId;

now the client uses the following code:

Console.WriteLine("Client 1...");
using (ServiceReference1.ServiceClient proxy = new ServiceReference1.ServiceClient("BasicHttpBinding_IService"))
Console.WriteLine("Client 2...");

using (ServiceReference1.ServiceClient proxy2 = new ServiceReference1.ServiceClient("BasicHttpBinding_IService"))

 the output in the Console is as follows:<

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