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Apr 14, 2010 03:23 AM|LINK
Thank you, you have saved me from pulling my hair out.
Updated web.config to add the line
<add assembly="System.Data.Linq, Version=188.8.131.52, Culture=neutral, publicKeyToken=b77a5c561934e089" />
to the system.web -> compilation -> assemblies section.
For some reason a 3.5 project adds this line but a 4.0 project does not.