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string mac = "";
ManagementClass mc = new ManagementClass("Win32_NetworkAdapterConfiguration");
ManagementObjectCollection moc = mc.GetInstances();
foreach (ManagementObject mo in moc)
{
//if((bool)mo["IPEnabled"] == true)
if (mo["IPEnabled"].ToString() == "True")
{
mac = mo["MacAddress"].ToString();
Console.WriteLine(mac);
}
}