Performance cost of a try/catch block [duplicate]

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From MSDN site:

Finding and designing away
exception-heavy code can result in a
decent perf win. Bear in mind that
this has nothing to do with try/catch
blocks: you only incur the cost when
the actual exception is thrown. You
can use as many try/catch blocks as
you want. Using exceptions
gratuitously is where you lose
performance. For example, you should
stay away from things like using
exceptions for control flow.

Also see these related SO questions: (1) (2) (3) and (4).

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