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    Guided course · C# Language

    C# Internals: ref, in, out and Byref Aliasing: back to the course

    Module 3 · Readonly Refs and Defensive Copies · Lesson 10 of 44

    ref readonly parameters and readonly ref returns

    3 min readTechInterviewNotes Editorial TeamUpdated 16 Sept 2026Save

    This lesson comes with Full Access

    Its text, video and cheat sheet open with Full Access. This course's free lessons open without an account. Start with A value is not a variable, and assignment vs ref assignment.

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