C# Dev for Beginners #22: Async/Await - Stop Blocking Threads and Start Writing Modern C#
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Video Description
Tasks were good. Async/await is beautiful. These two keywords transform how you write concurrent code - making it readable, efficient, and deadlock-free. This is modern C#.
What you'll learn: • What problem async actually solves (hint: not speed) • Why threads are expensive resources • The async keyword - enabling the state machine • The await keyword - releasing threads while waiting • Sync vs async execution flow • Why .Result and .Wait() are dangerous • The deadlock scenario explained • Async all the way down principle • async void - only for event handlers • ConfigureAwait basics • When to use async (I/O-bound work) • When NOT to use async (CPU-bound work)
Key insights: • Async isn't about speed - it's about not wasting resources • await releases the thread, .Result blocks it • Blocking on async code causes deadlocks in UI apps • Async methods should end with "Async" suffix • async void swallows exceptions - avoid it • ConfigureAwait(false) is for library code • Use async for I/O, Task.Run for CPU work • Once you go async, stay async all the way up
Common mistakes we'll avoid: • Calling .Result on the UI thread • Mixing sync and async code • Using async void outside event handlers • Forgetting the Async naming convention
Previous Video: Tasks - Modern Multithreading Next Video: Async Best Practices ► Full Playlist: https://www.youtube.com/playlist?list=PLGxFXI4dC2shfDgudNdh1FtSLcAZG0-Ba ► Code Repository: https://github.com/benday-inc/csharp-for-beginners-2025
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#CSharp #AsyncAwait #Async #DotNet #Programming #Threading #CodingTutorial #LearnToCode
0:00 Async/Await Basics 0:03 What We'll Cover 0:30 Myth: Async is about speed. 0:40 Truth: It's about resource utilization. 1:07 Indirectly faster...maybe. 1:24 Threads Are Expensive 2:18 Sync vs Async: What's Actually Happening? 2:46 What Does 'async' Actually Mean? 3:32 What Does 'await' Actually Mean? 4:12 Your First Async Method 5:06 The Naming Convention 5:40 ⚠️ Don't Block on Async Code 6:40 The Deadlock Scenario 7:20 The Fix: Async All The Way 8:00 Async void: The Exception 8:43 A Quick Note: ConfigureAwait 9:42 Q: When Should I Use Async? 10:39 Quick Recap 11:28 Thanks for Watching
Video Info
- Duration: 11:33
- Published: January 13, 2026
