Is it possible to write in C# for mobile platforms, WP and Android oriented?

Question

Android

Is it possible to write in C# for mobile platforms, WP and Android oriented? The dependence of this language on windows is a little scary. Heard about the Mono project, how much performance is lost when using Mono to port an android application? The question is inspired by many opinions that C# is a language for desktop applications. Should I continue to study it or immediately switch to some other language?

Answer 1

Unity and Xamarin support C#.

Answer 2

Xamarin. Here is a comparison of the xamarin machine and dalvik in terms of performance habrahabr.ru/post/215329