WF数据跟踪SqlTrackingService的问题

在练习WF的Hands-on Labs\Lab03部分的时候，遇到了一个如下的问题：

代码比较简单：

static string connectionString = "Initial Catalog=TrackingStore; " +

                   "Data Source=.; " +

                             "Integrated Security=SSPI;";

        static void Main(string[] args)

        {

            using(WorkflowRuntime workflowRuntime = new WorkflowRuntime())

            {

                workflowRuntime.AddService(new SqlTrackingService(connectionString));

                AutoResetEvent waitHandle = new AutoResetEvent(false);

                workflowRuntime.WorkflowCompleted += delegate(object sender,

                             WorkflowCompletedEventArgs e) { waitHandle.Set(); };

                workflowRuntime.WorkflowTerminated += delegate(object sender,

                                WorkflowTerminatedEventArgs e)

                {

                    Console.WriteLine(e.Exception.Message);

                    waitHandle.Set();

                };

                WorkflowInstance instance = workflowRuntime.CreateWorkflow(typeof

                   (DefaultSQLServices.Workflow1));

                instance.Start();

                instance.Suspend("Reason we are suspending the workflow.");

                instance.Resume();

                waitHandle.WaitOne();

                GetInstanceTrackingEvents(instance.InstanceId);

                Console.WriteLine("Workflow Completed - press ENTER to continue");

                Console.Read();

            }            

        }