On our build system, we were having two problems. First of all, there was a smoke test that was throwing an unhandled exception. Second of all, the .net framework was presenting a dialog to ask the user what to do about the exception. In the spirit of fail fast, this was causing a big problem for the entire build, since we normally don't have somebody staring at the build box, expecting to give user input. It's very important that the build box be headless and input-less. It's OK to have a management console like CruiseControl to request builds, but there should never be an interactive dialog.
I googled for an answer on how to automatically dismiss the dialog, and finally found the answer. Essentially, all you have to do is modify the registry key:
HKEY_LOCAL_MACHINE\Software\Microsoft\ .NETFramework\DbgJITDebugLaunchSetting
and change it's value to 1. This will allow the process throwing the unhandled exception to terminate with a stack dump with no user interaction.
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