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Explain GC Generations, LOH, and POH behavior.

Expert .NET Core
Quick Answer Gen0 collects short-lived objects — collected frequently, fast. Gen1 is a buffer between Gen0 and Gen2. Gen2 collects long-lived objects — full GC, expensive. LOH (Large Object Heap, objects >= 85KB) collects during Gen2 and isn't compacted by default (fragmentation risk). POH (Pinned Object Heap, .NET 5+) stores objects pinned for native interop safely.

Answer

Gen0 handles short-lived objects, Gen1 buffers promotions, and Gen2 manages long-lived objects. LOH (>=85 KB) is collected only during full GC. POH isolates pinned objects to avoid LOH fragmentation. GC modes include server, workstation, and background.

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