This value is treated as a key for the duration of the current session. If an ApplicationUser object is returned from this event it will be associated with this user and the event will not be raised again for this user name for the duration of this session.
Requirements
Target Platforms: Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2