class SvcClass: IServiceCall 
{
    static int callNumber = 0;
    public void OnCall()
    {
        callNumber++;
        System.Guid contextID = ContextUtil.ContextId;
        Console.WriteLine("This is call number "+ callNumber.ToString()); 
        Console.WriteLine(contextID.ToString());
        System.TimeSpan sleepTime = new System.TimeSpan(0,0,0,10); 
        System.Threading.Thread.Sleep(sleepTime);
    }
}
class EnterpriseServicesActivityClass
{
    [STAThread]
static void Main(string[] args)
    {
        ServiceConfig serviceConfig = new ServiceConfig();
        serviceConfig.Synchronization = SynchronizationOption.Required;
        serviceConfig.ThreadPool = ThreadPoolOption.MTA;
        SvcClass serviceCall = new SvcClass();
    Activity activity = new Activity(serviceConfig); 
        activity.AsynchronousCall(serviceCall); 
        activity.AsynchronousCall(serviceCall);
        Console.WriteLine("Waiting for asynchronous calls to terminate");
        Console.Read();
    }
}