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Did you know that most async/await mistakes are the result of misconceptions? Join this talk to discover how to detect common async/await mistakes, and how to fix them!

We'll be covering What You Need To Know about async/await in C#, including several different correct conceptual models of async/await that you can switch between at will. We will take a look at the common async pitfalls, best practices, and guidelines along with a careful examination of when to ignore the best practices. We'll be including some semi-advanced topics (specifically ValueTasks and Channels) to round out techniques for modern asynchronous development.

While this talk is geared towards developers who already use async and await, it would also be appropriate for those who do not (yet). Feel free to bring questions!

NDC Conferences

Stephen Cleary presents common mistakes developers make with async/await in .NET, covering conceptual misunderstandings (async doesn't mean background threads), dangerous patterns (async void, blocking on tasks), and practical pitfalls (fire-and-forget, eliding async/await, misusing Task APIs). He explains how async/await works through state machines, demonstrates proper composition patterns, and provides guidance on cancellation, exception handling, and avoiding deadlocks. The talk emphasizes letting async grow naturally through codebases and using await consistently rather than premature optimization.

Avoiding common pitfalls with async/await - Stephen Cleary - NDC Copenhagen 2025