Stage 2 · Lesson 5 of 6
async/await and Tasks
Most server work is waiting: for , an HTTP call or a file. async methods return a Task or Task<T>, and await pauses the method until the work finishes, freeing the thread to serve other requests in the meantime. That is why ASP.NET Core can handle many requests with a small .
Name methods with an Async suffix and return Task, never async void, except in event handlers. Start independent calls first and await them together with Task.WhenAll, so three 200 ms calls take about 200 ms, not 600. Async is not the same as parallel: it is about not blocking while waiting, not about using more CPU cores.
Common trapforgetting await: the method carries on before the work is done, and its exception disappears.
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Resources for this stage
Start with· follow one of these
- CoursePaidGrokking Data Structures & Algorithms for Coding Interviews
Design Gurus · Beginner · Subscription
Arrays, hash tables, lists, stacks and queues: what every C# collection is built on, with complexity explained
- GuideFree.NET documentation
Microsoft
Free official guides on LINQ, generics, collections and the asynchronous programming model