If you find yourself in a situation when you need to attach to a process from VS 2010, to debug, and you’re code is running in a “sandbox”. You need to attach to the process SPUserCodeService.exe, not w3wp.exe.
SharePoint 2010 hosts sandbox code in a secure service – the user code service – so it can monitor resources and make sure the user’s code isn’t performing any action that could compromise the platform.
From the SharePoint 2010 book I’m reviewing
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LOL, I see you’ve begun reviewing my book! :) GOOD!