Lets say I have a sample workflow that does the following:
Usually activity2 should run automatically after activity1 is finished, but I would like to prevent the execution of activity2 until the workflow gets the go ahead from a user. While activity1 is running, I want to be able to tell the workflow to pause after it is done activity1 and continue with activity2 when told.
I guess I need a flag that the workflow can check before it run activity2 but how can I update this flag while activity1 is running?
Create some kind of blocking activity, either using a bookmark or a WCF request and execute that before activity2 starts. That way you can tell it to resume. You can nest it in an If activity of you only want to wait if a certain condition has not been met.