VS 2010 extends these capabilities to handle ASP.NET 4.0 (and the new CLR 4.0). We already had the above multi-targeting capabilities in VS 2008. This is to ensure that the references are updated correctly when you change the target. Note: In VS 2010, we prompt you to reload the project when you change the target framework of a website project (VS 2008 used to do this for WAP projects). You can change targets from one ASP.NET framework to the other via the property pages (as you could in VS 2008).VS 2010 will show errors when you try to use 4.0 controls or properties in a web project targeting 2.0 or 3.5. Compilation and building of the web project works correctly based on the target framework, ie.Visual Studio automatically filters controls in toolbox, and types in intellisense and properties window based on the ASP.NET framework version being targeted.See 'Converting web projects from earlier versions of Visual Studio' section below for details. Like you could do with VS 2008, you can continue to have your web project target lower framework versions like ASP.NET 2.0 after conversion. You can convert and migrate your web applications built using earlier versions of Visual Studio to Visual Studio 2010.VS 2010 allows you to choose ASP.NET 2.0, 3.0, 3.5 or 4.0 as the target framework when you create a new Website or Web Application Project (WAP).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). 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). NET CLR 4.0 that installs side-by-side with earlier versions of the. With the release of the new ASP.NET 4.0 Beta1 framework (that runs on top of the. 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. But the capabilities we had for multi-targeting in VS 2008 were really a pseudo form of multi-targeting, i.e. We supported multi-targeting of web applications in Visual Studio 2008 as well. WhatвЂ™s different about Multi-targeting in Visual Studio 2010? Multi-targeting in VS 2010 also lets you continue to develop projects that were created using earlier versions of Visual Studio such as Visual Studio 2005 and Visual Studio 2008. NET Framework (such as 2.0, 3.0 and 3.5). The key benefit of multi-targeting is that you can use Visual Studio 2010 to create and develop new projects that target earlier versions of the. The multi-targeting feature of Visual Studio 2010 allows web developers to develop web applications targeting ASP.NET 2.0, 3.0, 3.5 and 4.0.

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