using System; using System.Security.Permissions; class MainClass { public static void MyMethod() { PrincipalPermission perm1 = new PrincipalPermission(null, @"MACHINE\Managers"); PrincipalPermission perm2 = new PrincipalPermission(null, @"MACHINE\Developers"); // Make the demand. perm1.Union(perm2).Demand(); } }