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How to debug the custom sandbox workflow actions in VS2010?
The sandbox workflow actions created following the steps in http://msdn.microsoft.com/en-us/library/ff798499.aspx
To debug a sandboxed solution you have to attach to Process to the SPUCWorkerProcess.exe assembly. Also check ULS logs and the Event viewer
Check this forum entry
http://social.technet.microsoft.com/Forums/eu/sharepoint2010programming/thread/6a1c3cb3-1634-4b96-bb2f-7c298940776d
