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I am creating some custom exceptions in my application.
If I have an exception that gets thrown after testing the state of an argument, Or I have an Exception that gets thrown after testing that an int is within the proper range, should my exceptions inherit ArgumentException and IndexOutOfRangeException or should they just inherit Exception?
Since inheritance is used to specify which exceptions to catch, you should respect this primarily when taking a decision.
Think of an IOException which carries additional information, or a ArgumentException other than ArgumentOutOfRangeException or ArgumentNullException.