如其检测网卡是否插了网线

如果检测网卡是否插了网线?
这个方法是检测当前状态是否能连上互联网，但如果我要访问的网站是本地网，而非互联网，则怎么使用？
  [DllImport("wininet.dll")]  
  private extern static bool InternetGetConnectedState(ref uint lpdwFlags, uint dwReserved);  
  /// <summary>
  /// 检查互联网联接状态
  /// </summary>
  /// <returns>返回是否与服务器联通状态</returns>
  public bool IsConnectedByServer()
  {
  uint connectionDescription = 0x0;
  bool isConnected = false;
  isConnected = InternetGetConnectedState(ref connectionDescription, 0);
  return isConnected;
  }


[解决办法]
没尝试过
=待高手的指点
[解决办法]
我也想了解，谢谢LZ.
[解决办法]
楼主可以试一下PING一些网站啊,在.net里执行DOS命令..以前试过.可以的.
[解决办法]
网卡灯亮了说明通了.
[解决办法]

C# code

NetworkInterface.GetIsNetworkAvailable()
[解决办法]
ping一下不就好了
[解决办法]
C# code
        private static ManagementClass mc;        private static ManagementObjectCollection moc;mc = new ManagementClass("Win32_NetworkAdapterConfiguration");                moc = mc.GetInstances();                foreach (ManagementObject mo in moc) //查找网卡配置                {string s = ((string)mo["Caption"]);                        if (s == NIC)                        {                            if ((bool)mo["DHCPEnabled"])  //此网卡未配置过IP                            {                                string[] ips = new string[1] { LocalIP };                                string[] masks = new string[1] { StationIPmask };                                Object[] objs = new object[2] { ips, masks };                                mo.InvokeMethod("EnableStatic", objs);                                NICValid = false;                                return;                            }                            string[] str = (string[])mo["IPAddress"]; //多个ip地址                            if (str.Length >= 3)                            {                                InfoString = "不能有多个IP地址绑定在此网卡上！";                                NICValid = false;                                return;                            }                            if (str.Length < 0)                            {                                InfoString = "请检查网卡设备！";                                NICValid = false;                                return;                            }                            if (str[0] == "0.0.0.0")                            {                                InfoString = "请检查网卡与交换机正确连接！";                                NICValid = false;                                return;                            }}