Visual Studio 2010 improves .NET framework multi-targeting by applying framework-appropriate filtering to the property grid and Intellisense. For example, if you select a button on a web form of a .NET 2.0 web project, in the Property Grid you will see: If you go to the Project Properties and change the Target Framework version to 4.0: ...the Property Grid display will change to display 4.0-specific properties: While this looks simple and straight-forward, there's actually an illusion at work! Only one framework can be loaded into an AppDomain at a time, and Visual Studio uses .NET 4.0 specific capabilities. So the actual controls displayed on the design surface are always 4.0 controls. Their properties are filtered for display in the Property...(read more) ...
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