Gets the user identifier from the membership data source for the user.
Assembly: System.Web.ApplicationServices (in System.Web.ApplicationServices.dll)
The property exposes the identifier from the membership data source typed as object. The type of the identifier depends on the MembershipProvider or the MembershipUser. In the case of the SqlMembershipProvider, the can be cast as a Guid, since the SqlMembershipProvider stores the user identifier as a UniqueIdentifier.