When I do I get this error message : Error 13 The type or namespace name '[projectname]' could not be found (are you missing a using directive or an assembly reference?). These .NET 3.5 dlls must remain in that framework because they are being used by other projects with the same framework. I wanted to upgrade just my project to 2013 and reference those old dlls. I don't understand why its not working. I even tried to dupicate the problem by creating a 3.5 dll in VS 2008 and then refereincing it in a 4.5 project in VS2013 and it worked with no problem. Am I missing something here. I've read online it has to do with the Client Profile version of the .NET Framework but that is not the case here. None of the projects are useing Client Profile.
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