判断PDA是否连接上网络，这个代码可以吗？哪个帮我实验一下，我用ActiveSync 连接的，这个判断可以吗？

       private enum ConnectionStateEnum
        {
            //Local system has a valid connection to the Internet, but it might or might not be currently connected.
            ConnectionConfigured = 64,
            //Local system uses a local area network to connect to the Internet.
            ConnectionLan = 2,
            //Local system uses a modem to connect to the Internet.
            ConnectionModem = 1,
            //No longer used.
            ConnectionModemBusy = 8,
            //Local system is in offline mode.
            ConnectionOffline = 32,
            //Local system uses a proxy server to connect to the Internet.
            ConnectionProxy = 4,
            //Local system has RAS installed.
            RasInstalled = 16

        }

        class Win32
        {
            [DllImport("Wininet.dll", CharSet = CharSet.Auto)]
            public static extern int InternetGetConnectedState(out int Flag, int Reserved);
        }

        private static int GetConnectionFlag()
        {
            int Flag;
            Win32.InternetGetConnectedState(out Flag, 0);
            return Flag;
        }

        public static bool IsModemConnected()
        {
            return ((GetConnectionFlag() & (int)ConnectionStateEnum.ConnectionModem) == 0) ?
            false : true;
        }

好像是不行，最先那段代码在直接跟PC同步的时候是不起作用的吧，我记得试过一次。

应该是可以触发的，官方的MSN客户端不是带一个“连接到网络就运行”吗（但我的没效果）？好像是可以注册一个系统事件，如果有网络变化它会通知你。