Getting Connection String?

I found the code (at the bottom) as a way to fish the connection string out of the config file. However, despite

using System.Configuration;

I cannot find these references--e.g. ConnectionStringSettings -- in System.Configuration. I find only

System.Configuration.ClientSettingsSection

System.Configuration.ConfigurationException

System.Configuration.ConfigurationSettings

System.Configuration.ConfigXmlDocument

Where is ConnectionStringSettings What am I missing

Thx, jess

http://msdn2.microsoft.com/en-us/library/z0kbht2d(en-US,VS.80).aspx

or

ConnectionStringSettings settings = ConfigurationSettings.ConnectionStrings[name];

DbProviderFactory factory = DbProviderFactories.GetFactory (settings.ProviderName);

DbConnection datasetConx = factory.CreateConnection();