All 20 Asynchronous Programming questions
More in Asynchronous Programming
What is the difference between Task and Task<T>? What do the 'async' and 'await' keywords do, and how do they relate to each other? What is the difference between the async and await keywords in C#, and how do they work together? How do you run multiple async operations concurrently? What does ConfigureAwait(false) do? Why does calling .Result or .Wait() on a Task risk causing a deadlock, particularly in ASP.NET (non-Core) or UI applications? What does ConfigureAwait(false) do, and when is it appropriate to use? How do you run multiple asynchronous operations concurrently and wait for all of them using Task.WhenAll? What are async streams in C#, and how does IAsyncEnumerable<T> differ from a regular IEnumerable<T> for handling large or slow data sources? Why can .Result or .Wait() deadlock, and what's the fix?
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What do async and await do?

Beginner

Answer

await asynchronously waits for a Task, releasing the thread until it completes, then resumes the method; async marks a method that uses await and returns a Task.
public async Task<string> LoadAsync(HttpClient h) => (await h.GetStringAsync("/x")).Trim();
Real-world example A web server frees the request thread during a DB call so it can serve other requests.
All 20 Asynchronous Programming questions