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;
}

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没尝试过
=待高手的指点
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我也想了解，谢谢LZ.
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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.
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网卡灯亮了说明通了.
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C# code

NetworkInterface.GetIsNetworkAvailable()

------解决方案--------------------
ping一下不就好了

------解决方案--------------------

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;
                            }
}

如其检测网卡是否插了网线

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