I tried the Handson lab 7 Exercise 1 of Beta 2 and intentionally change both the evaluation conditions function to

args.Result = true; // hard code to true

I would expect both code activities be executed since both conditions are true. The result shows otherwise. The handlers are executed alternatively. Is that by design, each loop (of CAG until loop) only evaluate one condition? And what's the order?

How can I achieve parallel executions?

Thanks.

You should read Nate's blog on parallelism in workflow, it is written about the parallel activity but pertains to the conditioned activity group (CAG). A code activity executes too quickly for you to tell that both are scheduled before the first one completes. Try the same thing with delay activities that have a 2 second timeout, both will execute and block. When the first delay expires the CAG's UntilCondition will be reevaluated and if it is false all children that are not already running will have their WhenCondition evaluated.