Gets the security identifier (SID) for the user.
Assembly: mscorlib (in mscorlib.dll)
The SID uniquely identifies a user or group on all Windows NT implementations.
The WindowsIdentity object returned by the GetAnonymous method is not the same as the Windows anonymous user. This property gets a null reference (Nothing in Visual Basic) for an anonymous user represented by the WindowsIdentity object returned by the GetAnonymous method; it does not get the SID representing an anonymous Windows user.