How to reference .NET 4.0 assembly within .NET 3.5 projects

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In short: you can’t.

.NET 4.0 is a totally new CLR (4.0) and as far as I know, cannot be intermixed with .NET 3.5 and/or used from VS 2008, sorry.

You could use .NET 2.0 assemblies from your .NET 4.0 code, if you also have a guarantee that the .NET 2.0 framework is on your target machine at the same time (side-by-side) with .NET 4.

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