Database Connection in code file/Behind???

Hi,
If this is my connection string in my web.config:
<add name="ConnectionString" connectionString="Data Source=.\SQLExpress;AttachDbFilename=|DataDirectory|\database.mdf;Integrated Security=True;User Instance=True" providerName="System.Data.SqlClient" />
How would I access/write it in a code file/Behind???
Also the following at my hosting connection string.
<add name="ConnectionString" connectionString="Data Source=database.db.2773491.hostedresource.com; Initial Catalog=database; User ID=databaseName; Password='password';" providerName="System.Data.SqlClient" />
Cheer,
Mike.
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