When to throw an exception?

Question

I have exceptions created for every condition that my application does not expect. UserNameNotValidException, PasswordNotCorrectException etc.

Answer 1

My little guidelines are heavily influenced by the great book "Code complete":

• Use exceptions to notify about things that should not be ignored.
• Don't use exceptions if the error can be handled locally
• Make sure the exceptions are at the same level of abstraction as the rest of your routine.
• Exceptions should be reserved for what's truly exceptional.