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Six Essential Tips For Async - Introduction

5 minutes, 31 seconds


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Async involves some new concepts. They're not difficult; just unfamiliar. Over the past year Lucian Wischik has been watching how people use async/await in C# and VB. This series distils out the three top async patterns and anti-patterns, and top three tips for writing your own async libraries.


  1. Async void is for top-level event-handlers only, and event-like things. Don't use it elsewhere in your code.
  2. It's crucial to distinguish CPU-bound work (should be done on threadpool) from IO-bound work (which needn't).
  3. Async library methods should have chunky async APIs not chatty. But if chatty is unavoidable, know about these micro-optimizations to reduce heap allocation overheads.
  4. Async library methods should consider task.ConfigureAwait(false) to reduce their impact on the UI message queue.
 If you understand the basic flow of control in an async method, then those three points all fall naturally into place. This first introduction video explains that control flow.
Slides and source code are available on Lucian's blog.


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  • felix9felix9 the cat that walked by itself

    Oh yeah, Lucianis wonderful.

  • Csaba VegsoCsaba Vegso

    Thanks. No need to dive into an hour long video just to understand the basic concept.

  • Pretty basic but pretty helpful indeed.
  • David XavierDavid Xavier

    There is some audio problems. There is another person talking in the backgrund

  • I do have to compliment Lucian's ability to present.  It's far better than most code-related presentations I wind up needing to watch!

  • banidyabanidya


  • DB AustinDB Austin

    I watched it twice, not because it was a complex concept - (Lucian did a fine job of explaining that (except for the hyper-space referenence is a little hokey) ) but because Lucian has such an interesting presentation voice. I felt like I was listening to a story around the campfire. Good...

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