public override void TraceStarting()
{
if (TD.StartBookmarkWorkItemIsEnabled())
{
TD.StartBookmarkWorkItem(this.ActivityInstance.Activity.GetType().ToString(), this.ActivityInstance.Activity.DisplayName, this.ActivityInstance.Id, ActivityUtilities.GetTraceString(Bookmark.AsyncOperationCompletionBookmark), ActivityUtilities.GetTraceString(Bookmark.AsyncOperationCompletionBookmark.Scope));
}
}