Can we make Android applications by using c# ?

Answer 1

yes, with xamarin

Answer 2

Yes.
Use IDEs like Unity ang Xamarin :D

Answer 3

Xamarin it is the best way and maybe Realm

Answer 4

Yes, it is possible.

Answer 5

yes, IDE Xamarin

Answer 6

and Visual Studio 2015

Answer 7

Unity uses C#. Unity can use other languages, but C# is the most popular language in that development environment.