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Mar 05, 2012 02:47 AM|LINK
VS 2010 default target to .NET 4.0, you can integrate .NET 3.5 to 4.0 but you can't integrate 4.0 to 3.5.
I think in VS 2010 you can compile the project to .NET 3.5 dll.
in this way:
Hope it helpful.