How to connect a SQL server DB to xamarin studio solution?

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C#

SQL

connection

Xamarin

I would like to know what´s the best way to connect a SQL Server DB to a Solution in Xamarin Studio in Android(with internal code(DAL), webservices or others), I've worked in C# before in web and desktop(WindowsForm) and I know how to manage a SQL connection to a DB in these ways, but I´m pretty new in Xamarin and Xamarin Studio, and I would like to connect my solution to a DB by the best practice for mobile development.

What I have tried:

I've seen examples with webservices references, but I would like to know if I can do it with internal code like a DAL or DLL, or which be the best practice for mobile development in xamarin