I am running workflows under asp.net and using SynchronizationContext to make the page "wait" for the workflow. Here is how I run the workflow instance under asp.net:

var workflowApplication = new WorkflowApplication(activity);
SynchronizationContext syncContext = SynchronizationContext.Current;
workflowApplication.Completed = delegate { syncContext.OperationCompleted(); };
workflowApplication.SynchronizationContext = syncContext;
syncContext.OperationStarted();
workflowApplication.Run();

In one of the activities I use a bookmark. Now I want the page processing to continue whenever I call CreateBookmark. I tried calling SynchronizationContext.Current.OperationCompleted() before setting the bookmark but that crushes asp.net site when the workflow resumes and completes (I think the workflow instance calls OperationCompleted again when it completes and the error raises)

How can I work with bookmarks under Asp.Net, any ideas?