Whats different about Multi-targeting in Visual Studio 2010?
We supported multi-targeting of web applications in Visual Studio 2008 as well. But the capabilities we had for multi-targeting in VS 2008 were really a pseudo form of multi-targeting, i.e. even though VS 2008 allowed us to target different versions of the ASP.NET framework 2.0, 3.0 and 3.5, the underlying Common Language Runtime (CLR) for all these frameworks is the same (= the .NET CLR 2.0). With the release of the new ASP.NET 4.0 Beta1 framework (that runs on top of the .NET CLR 4.0 that installs side-by-side with earlier versions of the .NET CLR) along with Visual Studio 2010 Beta1, we now have the ability in Visual Studio to target ASP.NET framework versions spanning multiple versions of the CLR (CLR 2.0 and CLR 4.0). VS 2010 can detect when your web project is targeting ASP.NET 2.0, 3.0 or 3.5 (that runs on top of CLR 2.0) versus targeting ASP.NET 4.0 (that runs on top of CLR 4.0). Accordingly: • VS 2010 allows you to choose ASP.NET 2.0, 3.0, 3.5 or 4.0 as the target framework wh
