It is used to kill an application. It's a static method that will instantly kill an application without being caught by any exception blocks.
Environment.FastFail(String) can
actually be a great debugging tool.
For example, say you have an
application that is just downright
giving you some weird output. You have
no idea why. You know it's wrong, but
there are just no exceptions bubbling
to the surface to help you out. Well,
if you have access to Visual Studio
2005's Debug->Exceptions... menu item,
you can actually tell Visual Studio to
allow you to see those first chance
exceptions. If you don't have that,
however you can put
Environment.FastFail(String) in an
exception, and use deductive reasoning
and process of elimination to find out
where your problem in.
Reference
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