Connect to External SQL Database in C#

You'll need the MySQL driver:

http://dev.mysql.com/downloads/connector/net/

You can then use the the MySqlConnection connection class to connect.

MySqlConnection connection = new MySqlConnection(connectionString);

http://www.codeproject.com/Articles/43438/Connect-C-to-MySQL

You can't use SqlConnection object to connect to MySQL database, you should use MySqlConnection instead after you import its dll