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.NET Interview Questions & Answers

.NET Technical Interview Questions

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Why does garbage collection not remove the need for IDisposable?

Garbage collection reclaims managed memory that is no longer reachable, on a schedule determined by the runtime. IDisposable provides deterministic cleanup for resources such as file handles, database...

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Does awaiting an asynchronous method always create a new thread?

No. await arranges continuation when an awaitable completes and does not itself create a thread. Genuine asynchronous I/O can release the current thread while waiting, whereas CPU-heavy work still nee...

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What is the difference between singleton, scoped, and transient dependency lifetimes?

A singleton instance is reused for the service container’s lifetime. A scoped service is reused within a scope, commonly one web request. A transient is created on each resolution. Choose according to...

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A LINQ query runs after its database context is disposed. Why can this fail, and how would you fix it?

Many LINQ operations build a deferred query rather than execute it immediately. Enumerating an IQueryable later can require the database context and connection, which are no longer available after dis...

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