Occurs when the application authenticates the current request.
Assembly: System.Web (in System.Web.dll)
The event is raised during the AuthenticateRequest event.
You can handle the event of the FormsAuthenticationModule class by specifying a subroutine named FormsAuthentication_OnAuthenticate in the Global.asax file for your ASP.NET application.
You can use the FormsAuthenticationEventArgs User property supplied to the FormsAuthentication_OnAuthenticate event to set the User property of the current HttpContext to a custom IPrincipal object. If you do not specify a value for the User property during the FormsAuthentication_OnAuthenticate event, the identity supplied by the forms authentication ticket in the cookie or URL is used.
The FormsAuthentication_OnAuthenticate event is only raised when the authentication mode is set to Forms in the authentication Element (ASP.NET Settings Schema) element of the application's configuration file and the FormsAuthenticationModule is an active HTTP module for the application.
Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2
The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.