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Explain the .NET Memory Model and its effect on multi-threading.

Expert .NET Core
Quick Answer The .NET memory model defines ordering guarantees between threads. Without synchronization, the CPU or compiler can reorder reads and writes รขโ‚ฌโ€ one thread might see stale values. lock adds full memory barriers (prevents reordering). volatile prevents caching. Interlocked provides atomic operations. Correct multi-threaded code needs explicit synchronization.

Answer

The .NET Memory Model defines visibility, ordering, and synchronization rules. It allows reordering unless blocked by barriers. Volatile improves visibility; Interlocked and lock introduce memory fences. Handles tearing, cache coherency, ABA issues, and provides relaxed consistency similar but less strict than Java.'s model.

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