Occurs just after deleting the session during sign-out.
Assembly: System.IdentityModel.Services (in System.IdentityModel.Services.dll)
This event is raised through a call to the OnSignedOut method from inside the WSFederationAuthenticationModule.SignOut(Boolean) method while signing out of the session at the relying party (RP). The event is not raised when doing federated sign-out through the FederatedSignOut method.
You can add an event handler to perform any additional processing that is needed by your application after the session cookie has been deleted.
This event is not guaranteed to be called for every session. Cookies may be deleted at the client side, for example, so this event would never be raised.