Answer
const: Compile-time constant; must be assigned at declaration.
readonly: Runtime constant; can be assigned at declaration or inside a constructor.
Readonly avoids versioning issues because its value is not embedded into IL.
Quick Answer
const is a compile-time constant — the value is baked into compiled code, must be a primitive or string, implicitly static. readonly is a runtime constant — set at declaration or in the constructor. Prefer readonly for complex values or when the value depends on runtime data.
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SugharaIQ Editorial Team
Verified Answer
This answer has been peer-reviewed by industry experts holding senior engineering roles to ensure technical accuracy and relevance for modern interview standards.
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Source: SugharaIQ