Answer
Compiler rewrites async methods into state machines stored as structs or classes.
Await posts continuations to SynchronizationContext or thread pool.
Avoid capturing context for performance.
Quick Answer
The compiler transforms an async method into a state machine struct. Each await point becomes a state. When awaited work completes, the continuation is posted to the SynchronizationContext or thread pool. No thread is blocked during the wait — the thread is returned to the pool and picked up again when needed.
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SugharaIQ Editorial Team
Verified Answer
This answer has been peer-reviewed by industry experts holding senior engineering roles to ensure technical accuracy and relevance for modern interview standards.
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Source: SugharaIQ