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.NET Concurrency & Parallelism

Async & Tasks

Task-based asynchronous programming, async/await behavior, cancellation, and production async flow.

19 drillsPractice one at a timeOrdered pathConcept questionComparison questionDebugging scenarioCode review

Recommended start

Async/Await

Explain async/await as C# syntax over Task-based asynchronous work, with attention to non-blocking I/O and request throughput.

Easy~5 minStep 1 of 19

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1Async/AwaitRecommended startExplain async/await as C# syntax over Task-based asynchronous work, with attention to non-blocking I/O and request throughput.Concept questionEasy~5 min.NETASP.NET CoreC#Practice 2

Practice order

19 drillsOne at a time

1Async/AwaitUp next / Easy / ~5 min
2Async is not a new threadEasy / ~5 min
3Await internalsMedium / ~7 min
4

Async is not a new threadClarify the common misconception that await starts work on a new thread, and explain what actually happens for I/O-bound operations.Concept questionEasy~5 min.NETASP.NET CoreC#

Practice

3Await internalsExplain the async state machine, continuation scheduling, and exception flow when a C# method awaits a Task.Concept questionMedium~7 min.NETASP.NET CoreC#Practice

4Task vs ThreadCompare Task and Thread in .NET, including abstraction level, scheduling, and when direct thread management is rarely appropriate.Comparison questionMedium~7 min.NETASP.NET CoreC#Practice

5Task.Run vs AwaitExplain when Task.Run is useful, when async/await is enough, and why Task.Run is usually wrong for I/O in ASP.NET Core.Comparison questionMedium~7 min.NETASP.NET CoreC#Practice

6Task.WhenAllUse Task.WhenAll to run independent asynchronous I/O operations concurrently while handling exceptions, cancellation, and dependency limits.Concept questionMedium~7 min.NETASP.NET CoreC#Practice

7CancellationTokenUse CancellationToken to stop wasted work when clients disconnect, timeouts expire, or background operations are being shut down.Concept questionMedium~7 min.NETASP.NET CoreC#Practice

8Timeout vs CancellationDistinguish timeouts from cancellation and explain how to combine them around external calls and request handling.Comparison questionMedium~7 min.NETASP.NET CoreC#Practice

9Fire-and-forget TasksExplain why starting background work without awaiting or tracking it is risky in ASP.NET Core applications.Concept questionMedium~7 min.NETASP.NET CoreC#Practice

10Sync-over-asyncInvestigate deadlocks or starvation caused by blocking on async code with Result, Wait, or GetAwaiter().GetResult().Debugging scenarioHard~12 min.NETASP.NET CoreC#Practice

11Thread Pool StarvationDiagnose thread-pool starvation caused by blocking work, unbounded concurrency, or sync-over-async in .NET APIs.Debugging scenarioHard~12 min.NETASP.NET CoreC#Practice

12ConfigureAwaitExplain what ConfigureAwait(false) does, why it mattered historically, and how to reason about it in ASP.NET Core and library code.Concept questionMedium~7 min.NETASP.NET CoreC#Practice

13Missing CancellationTokenReview async .NET code that does not accept or propagate CancellationToken and explain the practical production risk.Code reviewMedium~10 min.NETASP.NET CoreC#Practice

14Blocking Async APIInvestigate a production API slowdown caused by blocking async calls, thread-pool pressure, and dependency waits.Debugging scenarioHard~12 min.NETASP.NET CoreC#Practice

15WhenAll ExceptionsExplain how Task.WhenAll behaves when one or more tasks fail and how to inspect failures safely.Concept questionMedium~7 min.NETASP.NET CoreC#Practice

16Async StreamsCompare synchronous enumeration with async streaming and explain when IAsyncEnumerable helps with large or delayed data.Comparison questionMedium~7 min.NETASP.NET CoreC#Practice

17IAsyncDisposableExplains when cleanup needs asynchronous I/O, how await using guarantees disposal, and how ownership, exceptions, DI lifetimes, and shutdown affect the design.Concept questionMedium~7 min.NETASP.NET CoreC#Practice

18async voidExplain why async void is usually dangerous outside event handlers and how exceptions behave differently.Concept questionEasy~5 min.NETASP.NET CoreC#Practice

19CTS LifetimeExplain why CancellationTokenSource lifetime matters and how careless timeout creation can leak timers or resources.Concept questionMedium~7 min.NETASP.NET CoreC#Practice

Task vs Thread

Medium / ~7 min

5Task.Run vs AwaitMedium / ~7 min

6Task.WhenAllMedium / ~7 min

7CancellationTokenMedium / ~7 min

8Timeout vs CancellationMedium / ~7 min

+11 more drills in this section

Async & Tasks - .NET Concurrency & Parallelism | Aporeon