System.Net.SocketPermission.Intersect C# (CSharp) Method

        public override IPermission Intersect(IPermission target) {
            // Pattern suggested by Security engine
            if (target == null) {
                return null;
            }

            SocketPermission other = target as SocketPermission;
            if(other == null) {
                throw new ArgumentException(SR.GetString(SR.net_perm_target), "target");
            }

            SocketPermission result;
            if (m_noRestriction) {
                result = (SocketPermission)(other.Copy());
            }
            else if (other.m_noRestriction) {
                result = (SocketPermission)(this.Copy());
            }
            else {
                result = new SocketPermission(false);
                intersectLists(m_connectList, other.m_connectList, result.m_connectList);
                intersectLists(m_acceptList, other.m_acceptList, result.m_acceptList);
            }

            // return null if resulting permission is restricted and empty
            if (!result.m_noRestriction &&
                result.m_connectList.Count == 0 && result.m_acceptList.Count == 0) {
                return null;
            }
            return result;
        }