The System.Configuration Namespace holds your answer.

Try this http://msdn.microsoft.com/en-us/library/aa730869(VS.80).aspx">http://msdn.microsoft.com/en-us/library/aa730869(VS.80).aspx

or this http://www.codeplex.com/csd or this http://msdn.microsoft.com/en-us/library/system.configuration.configurationmanager.aspx