Assembly: System.Web (in System.Web.dll)
The event is raised before the RoleManagerModule creates a RolePrincipal object and assigns it to the User property of the Current HttpContext. You can use this event to audit when role information is applied or to replace the creation of a RolePrincipal by the RoleManagerModule with your own code.
The following example shows the event included in the Global.asax file for an ASP.NET application. The event adds a trace notification for an application where trace is enabled in the Web.config file.