Missing System.Core.dll and others on Visual Studio 2010 Project targeting 3.5 Framework

Posted by Mark Struzinski on Stack Overflow See other posts from Stack Overflow or by Mark Struzinski
Published on 2010-04-15T13:16:29Z Indexed on 2010/04/24 19:03 UTC
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visual-studio-2010

I just got Visual Studio 2010 installed and running on my development machine (alongside VS 2008). The first thing I did was make a copy of an existing project and convert it up to the VS 2010 project. I told the conversion wizard to leave the project targeting the 3.5 framework. The project compiles and runs just fine in VS 2008. When I go to build it, several of my references are marked as missing (System.Core, System.Xml.Linq, System.Data.DataSetExtensions). When I go to the Add Reference dialog, they are not present. Yet if I view the GAC at C:\Windows\Assembly, I can see the entries there.

I have tried converting the projects to 4.0, then back down to 3.5, and also unloading/reloading the projects. Nothing works. Has anyone else ran across this problem?

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