Which .NET exception to throw for invalid database state?

Posted by jslatts on Stack Overflow See other posts from Stack Overflow or by jslatts
Published on 2010-04-13T16:44:28Z Indexed on 2010/04/13 16:53 UTC
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.NET

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c#

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exception-handling

I am writing some data access code and I want to check for potentially "invalid" data states in the database. For instance, I am returning a widget out of the database and I only expect one. If I get two, I want to throw an exception. Even though referential integrity should prevent this from occurring, I do not want to depend on the DBAs never changing the schema.

I would like to use the System.IO.InvalidDataException, except that I am not dealing with a file stream so it would be misleading. I ended up going with a generic applicationexception. Anyone have a better idea?

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