There are differences between the classes available within the Windows Phone world, and the Xamarin world. While they both share the same language (C#) and there are some crossover between libraries, there is not a 1:1 correlation.
If you are having troubles getting started, I highly suggest taking a look at the Getting Started guide . As you are a Visual Studio user, it may be more accurate to ensure that you are reading Visual Studio centric documentation. On pages where a difference may exist, there is a toggle on the upper right that will allow you to focus on Visual Studio. The toggle will look similar to this screenshot
I hope this helps!
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