How can I wait till the Parallel.ForEach completes

Question

You don't have to do anything special, Parallel.Foreach() will wait until all its branched tasks are complete. From the calling thread you can treat it as a single synchronous statement and for instance wrap it inside a try/catch.

You don't need that with Parallel.Foreach: it only executes the foreach in as many thread as there are processors available, but it returns synchronously.

More information can be found here

As everyone here said - you dont need to wait for it. What I can add from my experience: If you have an async body to execute and you await some async calls inside, it just ran through my code and did not wait for anything. So I just replaced the await with .Result - then it worked as intended. I couldnt find out though why is that so :/