Configuration Files

There are several different types of configuration files
Machine - machine.config
Application - app.config
User - user.config
Security - web.config
Isolated Storage

System.Configuration provides all the necessary functionality for reading and writing from config files.

Configuration Manager

System.Configuration.ConfigurationManager

GetSection - retrieves a specified configuration section from the current applications default configuration

System.Configuration.ConfigurationManager.GetSection("applicationSettings/"------".MySettings) 

Security Configuration File