The ApplicationConfiguration class lets you use a class to represent configuration settings that can be persisted in a variety of ways. The default mode persists in web.config and provide strongly typed object properties for settings. You can also save to external files, a database record or a string. Effectively you can access App.Configuration.Property from anywhere in your application.

Please note that in order to run this demo effectively you need to be able to update settings in web.config and external files in the Web folder since it tries to write settings. Writing of config settings is optional but quite useful and for this demo it's recommended you give full access to NETWORK SERVICE (or whatever your IIS host account is).