NGWS SDK Documentation  

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Setting Policy for Creating Principal and Identity Objects

Trusted code creating an application domain can set the application domain policy that controls construction of the default Principal and Identity objects. This application domain-specific policy applies to all execution threads in that application domain. An unmanaged, trusted host inherently has the ability to set this policy; but managed code creating an application domain (AppDomain) must have the System.Security.Permissions.SecurityPermission(PrincipalObjectManagement) permission to set this policy.

You call the static SetPrincipalPolicy method on the AppDomain object to set the policy, passing in a PrincipalPolicy enumeration value that indicates what the new policy should be. Supported values are NoPrincipal, UnauthenticatedPrincipal, and WindowsPrincipal.