C# Dev for Beginners #21: Tasks - Multithreading with Task.Run, WhenAll, and the Thread Pool
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Video Description
Stop using new Thread(). Modern C# uses Tasks. They're lighter, smarter, and the foundation for async/await. Time to do multithreading the right way.
What you'll learn: • Why Tasks beat raw Threads • The thread pool - reuse over recreation • Task.Run for CPU-bound work • Task for returning values • await vs Wait() vs Result • Task.WhenAll - parallel execution • Task.WhenAny - racing operations • Exception handling in Tasks • AggregateException for multiple failures • Fire-and-forget dangers • async void lambda trap • CPU-bound vs I/O-bound work
Key insights: • Threads are expensive, Tasks are cheap • Thread pool maintains reusable threads • await releases the thread, Wait() blocks it • Always await or observe your Tasks • Fire-and-forget loses exceptions silently • async void should only be for event handlers • Task.Run for CPU work, await for I/O work • WhenAny + Delay = timeout pattern
We'll build: • Parallel file downloader • Timeout wrapper for any operation • Progress reporting pattern • Multi-task error handling
Previous Video: Thread-Safe Collections Next Video: Async/Await Basics ► Full Playlist: https://www.youtube.com/playlist?list=PLGxFXI4dC2shfDgudNdh1FtSLcAZG0-Ba ► Code Repository: https://github.com/benday-inc/csharp-for-beginners-2025
Tasks finally make sense? Smash that like button! Subscribe and enable notifications - next up we tackle async/await! Task.Run or await directly? Tell me your approach in the comments!
#CSharp #Tasks #ThreadPool #DotNet #Programming #Async #Parallel #CodingTutorial #LearnToCode
0:00 Tasks - Modern Multithreading 1:09 The Thread Pool Changes Everything 1:37 Thread vs Task Creation 1:57 Your First Task 2:36 Tasks That Return Values 3:22 Waiting for Tasks 4:07 Running Multiple Tasks 4:50 Task.WhenAny - First One Wins 5:27 Exception Handling in Tasks 6:12 AggregateException - Multiple Failures 6:56 Don't Fire and Forget 7:54 Async Lambdas Trap 8:17 When To Use Task.Run 9:17 CPU-Bound vs I/O-Bound 10:50 Practical Pattern: Timeout 11:27 Practical Pattern: Progress Reporting 12:09 Q: Common Task Questions 13:02 Key Takeaways 13:56 Practice Challenge
Video Info
- Duration: 15:21
- Published: December 16, 2025
