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Creating and Using Custom Exceptions

Creating custom exceptions is useful for when you need to attach more information to an exception than what is provided by the predefined exception classes or when there is a situation in your application that is not covered by a predefined exception class. This is often the case when you are building custom control or class libraries and you need to generate exceptions that are unique to your components.

Any custom exception class that you build should be derived from the ApplicationException class or at least the Exception class. However, this is not required. In fact, you can throw an exception with any class. This is not recommended, though, because you do lose some of the basic features that the Exception ...