Another small improvement is that you can use the await keyword inside catch and finally blocks. This was not initially allowed when this incredibly useful feature was added to C# 5. There is not a lot more to say about this. The implementation is complex, but you don't need to worry about this unless you're interested in the internals. From a developer's point of view, it just works, as in this simple example:
catch (Exception e) when (e?.Message?.Length > 0){ await Task.Delay(200);}
This feature has been improved in C# 7, so read on. You will see async and await used a lot throughout this book. Asynchronous programming is a great way of improving performance and not just from within your C# code.
