Possible duplicate:Can I use the beta version of .NET 4.0 in Visual Studio 2008?
Hot can I use visual studio 2008 IDE with .net framework 4?
I think the general consensus is "no"
Can I use the beta version of .NET 4.0 in Visual Studio 2008?
No, VS 2008 Multi Targeting only supports .NetFramework 3.5, 3.0, 2.0
so it has backward compatibility, so you need to use VS 2010 for .netFramework 4.0
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