Assembly: System (in system.dll)
Each settings wrapper class, derived from ApplicationSettingsBase, has an associated settings key, which is a string that helps disambiguate different instances of the same wrapper in a single application. Because each wrapper class defines a set of properties that represent application settings, the settings key can similarly help disambiguate their use.
Windows 98, Windows 2000 SP4, Windows Millennium Edition, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition
The .NET Framework does not support all versions of every platform. For a list of the supported versions, see System Requirements.