Gets or sets the System.Security.Principal.IPrincipal object to be associated with the request. This class is deprecated.
a System.Security.Principal.IPrincipal
This class has been deprecated and is no longer supported. Microsoft Passport Network has been replaced by Windows Live ID. For more information about how to use Windows Live ID to authenticate users in a Web application, see tp://go.microsoft.com/fwlink/?LinkId=106346.