System.Net.NetworkInformation.NetworkInformationPermission.Union C# (CSharp) Method

        public override IPermission Union(IPermission target) => null;
        public override IPermission Intersect(IPermission target) => null;

        public static void CreatePermission()
        {
            //<Snippet6>
            //<Snippet5>
            //<Snippet2>
            //<Snippet1>
            System.Net.NetworkInformation.NetworkInformationPermission unrestricted =
                new System.Net.NetworkInformation.NetworkInformationPermission(
                    System.Security.Permissions.PermissionState.Unrestricted);
            //</Snippet1>

            Console.WriteLine("Is unrestricted? " + unrestricted.IsUnrestricted());
            //</Snippet2>

            //<Snippet4>
            //<Snippet3>
            System.Net.NetworkInformation.NetworkInformationPermission read =
                new System.Net.NetworkInformation.NetworkInformationPermission(
                    System.Net.NetworkInformation.NetworkInformationAccess.Read);
            //</Snippet3>
            System.Net.NetworkInformation.NetworkInformationPermission copyPermission =
                (System.Net.NetworkInformation.NetworkInformationPermission)read.Copy();
            //</Snippet4>
            System.Net.NetworkInformation.NetworkInformationPermission unionPermission =
                (System.Net.NetworkInformation.NetworkInformationPermission)read.Union(unrestricted);
            Console.WriteLine("Is subset?" + read.IsSubsetOf(unionPermission));
            //</Snippet5>
            System.Net.NetworkInformation.NetworkInformationPermission intersectPermission =
                (System.Net.NetworkInformation.NetworkInformationPermission)read.Intersect(unrestricted);
            //</Snippet6>

            //<Snippet7>
            System.Net.NetworkInformation.NetworkInformationPermission permission =
                new System.Net.NetworkInformation.NetworkInformationPermission(
                    System.Security.Permissions.PermissionState.None);
            permission.AddPermission(
                System.Net.NetworkInformation.NetworkInformationAccess.Read);
            Console.WriteLine("Access is {0}", permission.Access);
            //</Snippet7>
        }