How to create an extension method for ToString?

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Extension methods are only checked if there are no applicable candidate methods that match. In the case of a call to ToString() there will always be an applicable candidate method, namely, the ToString() on object. The purpose of extension methods is to extend the set of methods available on a type, not to override existing methods; that’s why they’re called “extension methods”. If you want to override an existing method then you’ll have to make an overriding method.

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