trying to connect ms sql database

I want to use MS Sql database in my unity game. I tried

using System.Data;
using System.Data.Sql;
using System.Data.SqlClient;

in mono development. but I am not able to use this class. Can anyone tell me how I can make connection to my database in mono using c#.

Hi, i’m not sure but i think that there was a way to use the c# classes but you will only be able to use it on Windows platforms if you want to be able to connect from mac, android or other platforms better is using a php brige
here you got a link:
http://forum.unity3d.com/threads/24721-Tutorial-Unity-and-PHP-login-script-simple-but-useful
link for c# problema and posible solution:
http://forum.unity3d.com/threads/11466-Reading-database-and-or-spreadsheets