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The thread is never blocked — this is the key difference from `.Result`\u002F`.Wait()`.",{"id":188,"topic":30,"difficulty":171,"body":189,"options":190,"correct_key":184,"explanation":199},"019f70e2-e784-709d-aa21-f3126e356753","Why can't the caller of an `async void` method await its completion?",[191,193,195,197],{"key":175,"text":192},"Because `async void` methods always run synchronously",{"key":178,"text":194},"Because `async void` methods return no value",{"key":181,"text":196},"Because `async void` methods are not allowed to contain `await` expressions",{"key":184,"text":198},"Because `async void` gives the caller no `Task` to hold and await","An `async Task` method returns a `Task` handle the caller can await, observe exceptions on, or compose with `WhenAll`\u002F`WhenAny`. An `async void` method returns nothing at all — there is no handle, so the caller has no way to know when it finished or whether it threw.",{"id":201,"topic":30,"difficulty":171,"body":202,"options":203,"correct_key":175,"explanation":212},"019f70e2-e786-7144-90cd-1d294c13df16","Which of the following statements about the C# `lock` statement is correct?",[204,206,208,210],{"key":175,"text":205},"A reference-type object is required as the lock monitor; a value type causes a compile error",{"key":178,"text":207},"`lock` can be used directly on any value type, including `int` or a `struct`",{"key":181,"text":209},"`lock` only works inside methods marked `async`",{"key":184,"text":211},"`lock` automatically releases its monitor once the containing class is garbage collected","`lock (obj)` requires `obj` to be a reference type because the monitor is tied to the object's identity (its sync block on the heap). Passing a value type is a compile-time error (CS0185), since boxing would create a new object each time and the lock would never actually synchronize anything.",{"id":214,"topic":30,"difficulty":171,"body":215,"options":216,"correct_key":181,"explanation":225},"019f70e2-e788-7917-a07b-e9962f15dbe4","What does passing `CancellationToken.None` to an async method mean?",[217,219,221,223],{"key":175,"text":218},"The operation is guaranteed to run on a background thread",{"key":178,"text":220},"The method throws immediately because no token was supplied",{"key":181,"text":222},"The method receives a token that can never be canceled",{"key":184,"text":224},"The default token cancels the operation after a fixed timeout","`CancellationToken.None` returns a real, valid `CancellationToken` value whose `IsCancellationRequested` is always `false` and which is never signaled. It's the safe placeholder to pass when there's genuinely no cancellation source, and it costs nothing extra to check.",{"id":227,"topic":30,"difficulty":171,"body":228,"options":229,"correct_key":184,"explanation":238},"019f70e2-e78c-787f-bc43-db017d3ab545","What is `Task.CompletedTask` typically used for?",[230,232,234,236],{"key":175,"text":231},"To start a brand-new task on the thread pool",{"key":178,"text":233},"To cancel every currently running task in the application",{"key":181,"text":235},"To block the calling thread until all pending tasks finish",{"key":184,"text":237},"An already-completed `Task` singleton, useful to satisfy a `Task`-returning signature","`Task.CompletedTask` is a cached, already-completed `Task` singleton. It's commonly returned from a method that implements an interface requiring `Task` but has nothing asynchronous to do in a given branch, avoiding an unnecessary allocation.",{"id":240,"topic":30,"difficulty":171,"body":241,"options":242,"correct_key":178,"explanation":251},"019f70e2-e793-7d2d-969c-bf4efb2eaaf2","The C# `lock (obj) { ... }` statement is essentially syntactic sugar for which underlying pattern?",[243,245,247,249],{"key":175,"text":244},"`Interlocked.Increment(ref obj)` wrapped around the block",{"key":178,"text":246},"`Monitor.Enter(obj)` plus a `try\u002Ffinally` that calls `Monitor.Exit(obj)`",{"key":181,"text":248},"`SemaphoreSlim.Wait()` called with a timeout of zero",{"key":184,"text":250},"`Task.Run(() => obj)` wrapping the block's body","The compiler lowers `lock (obj) { body }` into `Monitor.Enter(obj); try { body } finally { Monitor.Exit(obj); }` (with the two-argument `Enter` overload for reliability). 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