Change Target Framework of all the projects automatically
Recently I had a need to change all my project’s target framework to 4.0. Usually you can just right click on the project and change this by going in to properties. I needed to do this for 34 project within a single solution file. After googling I landed on an article by Scott dorman who has written nice macro to do this job automatically.
Change TargetFramework for all the projects in Visual Studio 2010
Download Macro project from Here