If you're attending a dev event you probably think you know what a foreach loop does - it iterates over a collection, right?

Well... yes.

BUT do you know how? Do you know what the C# compiler does when you write a foreach loop? What about a lambda expression? Or the re-entrant magic that is a yield return statement?

In this session we'll dive into Roslyn, the C# compiler, and learn about lowering and how it helps the compiler do its job, and what it does to your code. In the process you'll gain the skills to identify some of the common performance pitfalls of .NET, as well as just get a deeper understanding of what the code you write really does.