mono/mcs/class/referencesource/System.ServiceModel/System/ServiceModel/InstanceContextMode.cs

//------------------------------------------------------------
// Copyright (c) Microsoft Corporation.  All rights reserved.
//------------------------------------------------------------

namespace System.ServiceModel
{
    public enum InstanceContextMode
    {
        PerSession,
        PerCall,
        Single,
    }

    static class InstanceContextModeHelper
    {
        static public bool IsDefined(InstanceContextMode x)
        {
            return
                x == InstanceContextMode.PerCall ||
                x == InstanceContextMode.PerSession ||
                x == InstanceContextMode.Single ||
                false;
        }
    }

}