Why is string.Empty readonly? [duplicate]

This question already has answers here: Closed 11 years ago.

Possible Duplicate:

Why isn't String.Empty a constant?

...and not const?

I know its probably a useless question, but I'm sort of curious on the reasoning behind this one. An empty string is an empty string so I do not foresee many chances of string.Empty being anything else than "". So why make it readonly?

Is the开发者_运维问答re any other benefit I'm missing in not making it const?

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It IS static.

public static readonly string Empty;

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Readonly prevents it from being changed. Perhaps you mean "why isn't it a const"?