try catch - Does the C# "finally" block ALWAYS execute?

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Answer 1

No it does not. It will always execute provided the application is still running (except during a FastFail exception, MSDN link, like others noted). It will execute when it exits the try/catch portion of the block.

It will NOT execute if the application crashes: gets killed through a kill process command etc. This is highly important, because if you write code that absolutely expects it to run, like manually doing a roll back, and if not other wise it will automatically commit, you can run into a scenario the application aborts before that happens. Honestly, this is an outside scenario, but it is important to take note of in those situations.