Possible Duplicate:
Can I use .NET 4.0 beta in Visual Studio 2008?
Hot can I use visual studio 2008 IDE with .net framework 4?
Possible Duplicate:
Can I use .NET 4.0 beta in Visual Studio 2008?
Hot can I use visual studio 2008 IDE with .net framework 4?
I think the general consensus is "no"
http://stackoverflow.com/questions/998090/can-i-use-net-4-0-beta-in-visual-studio-2008
Regards bgs264
No, VS 2008 Multi Targeting option only support .NetFramework 3.5 , 3.0 , 2.0
so it has a Backward Compatability, So You have to Use VS 2010 for .netFramework 4.0