Parallelism. Using Parallel.For and ConcurrentBag.

Parallelism refers to the technique of running multiple calculations at the same time to speed up a computer program. Historically, this has been a complicated thing to write requiring a developer to do complicated coding including low-level manipulation of threads and locks. A program will generally run faster if you allow it to execute multiple calculations at the same time. For example, you might have a program where you need check how many orders a customer has, and instead of looping through each customer to check on their orders, you could check on multiple customers at the same time by…