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What is the difference between public API and internal API in C#?

Mid C#
Quick Answer public API is accessible from any assembly รขโ‚ฌโ€ your external contract. internal API is only accessible within the same assembly รขโ‚ฌโ€ useful for sharing code between classes without exposing it to consumers. Use InternalsVisibleTo to grant test projects access to internal members.

Answer

Public API: Accessible from any assembly.

Internal API: Accessible only within the same assembly.

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