What is the purpose of the GC (Garbage Collector) in .NET? How does it work?

Mid C# Published: Nov 21, 2025

Quick Answer The GC automatically reclaims heap memory using a generational model. Gen0 holds new objects and is collected most often. Gen1 holds objects that survived one collection. Gen2 holds long-lived objects and is collected rarely. Most objects die young â€” this model exploits that to stay efficient.

Answer

The Garbage Collector (GC) frees unused heap objects automatically.

It uses generations (Gen0, Gen1, Gen2) to optimize collection of short-lived and long-lived objects.

The GC pauses execution, removes unreachable objects, and compacts memory.

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What is the purpose of the GC (Garbage Collector) in .NET? How does it work?

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