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OptionalReliableSession Class

Provides convenient access to whether a reliable session is enabled when using one of the predefined bindings where it is optional.

Namespace:  System.ServiceModel
Assembly:  System.ServiceModel (in System.ServiceModel.dll)

public class OptionalReliableSession : ReliableSession

The ability to enable a reliable session is provided with three of the system-provided bindings. A reliable session is:

The following example shows how to create a new reliable session, access and change the default values of that session.

private void Run()
    WSHttpBinding b = new WSHttpBinding();
    b.Name = "HttpOrderedReliableSessionBinding";

    // Get a reference to the OptionalreliableSession object of the  
    // binding and set its properties to new values.
    OptionalReliableSession myReliableSession = b.ReliableSession;
    myReliableSession.Enabled = true; // The default is false.
    myReliableSession.Ordered = false; // The default is true. 
    myReliableSession.InactivityTimeout = 
        new TimeSpan(0, 15, 0); // The default is 10 minutes. 
    // Create a URI for the service's base address.
    Uri baseAddress = new Uri("http://localhost:8008/Calculator");

    // Create a service host.
    ServiceHost sh = new ServiceHost(typeof(Calculator), baseAddress);

    // Optional: Print out the binding information. 
    // Create a URI for an endpoint, then add a service endpoint using the 
    // binding with the latered OptionalReliableSession settings.
    sh.AddServiceEndpoint(typeof(ICalculator), b, "ReliableCalculator");



private void PrintBindingInfo(WSHttpBinding b)
    Console.WriteLine("Enabled: {0}", b.ReliableSession.Enabled);
    Console.WriteLine("Ordered: {0}", b.ReliableSession.Ordered);
    Console.WriteLine("Inactivity in Minutes: {0}",


Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.

Windows 7, Windows Vista, Windows XP SP2, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003

The .NET Framework and .NET Compact Framework do not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

.NET Framework

Supported in: 3.5, 3.0