Upgrading Windows Phone 7 app to Mango

I want to test the fast app switching and some other new features introduced in Windows phone Mango with my existing Windows Phone 7 app. I have installed Mango developer tools, but if I open my existing windows phone 7 app and try to use Mango SDK functions, it is not allowing me to use those functions. Can anyone tell me how to upgrade a Windows Phone 7 App into Windows Phone Mango ?.


In Visual Studio, open the existing solution. In Solution Explorer, right-click the Windows Phone project(s), and then click Upgrade to Windows Phone 7.1 .

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