Which is the most important code analysis rule and why? [closed]

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A large set of code analysis rules is defined within Visual Studio and FxCop but which one do you find to be the most important and most critical to conform and why?

Retrospectively, could any of the rules have saved you a lot of time/money if you had enforced them from the start or at least before your product was released?

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CA1031: Do not catch general exception types