Gets the identifier for the key generation in this token
Assembly: System.IdentityModel (in System.IdentityModel.dll)
The property is unique within a session token. When a session token is issued it has only a context ID, which is accessible through the ContextId property. When the session token is renewed, the key generation is added.
The SessionSecurityTokenHandler class serializes this property as the <Instance> child element of the <wsc:SecurityContextToken> element. For more information, see the documentation for the SessionSecurityTokenHandler.WriteToken method.