IdentityNotMappedException Represents an exception for a principal whose identity could not be mapped to a known identity.

 IdentityReferenceCollection Represents a collection of objects and provides a means of converting sets of -derived objects to -derived types.

 NTAccount Represents a user or group account.

 SecurityIdentifier Represents a security identifier (SID) and provides marshaling and comparison operations for SIDs.

 WindowsIdentity Represents a Windows user.

 WindowsPrincipal Enables code to check the Windows group membership of a Windows user.

 TokenAccessLevels Defines the privileges of the user account associated with the access token.

 WellKnownSidType Defines a set of commonly used security identifiers (SIDs).

 WindowsAccountType Specifies the type of Windows account used.

 WindowsBuiltInRole Specifies common roles to be used with .

 IdentityReference Represents an identity and is the base class for the and classes. This class does not provide a public constructor, and therefore cannot be inherited.