> I'm not sure what the 1000x exception rule of thumb is

An exception is roughly 1000x as slow as "normal" flow control statements.
So the general rule of thumb is that if the exception is likely to occur
more than one in a thousand times you perform an operation, you might want
to consider a normal return code instead of an exception. Witness
Int32.Parse and Int32.TryParse. Or TextReaderForTopic versus HasPermission.
:) 



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