System.Net.NetworkInformation.NetworkChange.CloseSocket C# (CSharp) Method

        private static void CloseSocket()
        {
            Debug.Assert(s_socket != 0, "s_socket was 0 when CloseSocket was called.");
            Interop.Error result = Interop.Sys.CloseNetworkChangeListenerSocket(s_socket);
            if (result != Interop.Error.SUCCESS)
            {
                string message = Interop.Sys.GetLastErrorInfo().GetErrorMessage();
                throw new NetworkInformationException(message);
            }

            s_socket = 0;
        }