How to get Ethernet MAC address? NOT enabled MAC Address

snowycanada used Ask the Experts™
As the title, I just need Ethernet network adapter's physical address to create password. Viusal studio 2010 C#, Windows 7 professional
Had tried different way but failed.
Seems each solution just catch the enabled one.
As attached sample1, I had tried sort by spercial word, but not every ethernet adapter description has "PCI"
Attached sample2 is the way to get the enable adapter MAC address, unuseful either.

How can i get the ethernet adapter physical address when the computer is working in wireless network?
ManagementClass mc = new ManagementClass("Win32_NetworkAdapterConfiguration");
            ManagementObjectCollection moc = mc.GetInstances();
            string MACAddress = String.Empty;
            foreach (ManagementObject mo in moc)
                if (MACAddress == String.Empty) // only return MAC Address from first card
                    if ((bool)mo["IPEnabled"] == true) MACAddress = mo["MacAddress"].ToString();

            MACAddress = MACAddress.Replace(":", "");

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NetworkInterface[] fNetworkInterfaces = NetworkInterface.GetAllNetworkInterfaces();
             foreach (NetworkInterface adapter in fNetworkInterfaces)
                 string strDescription = adapter.Description.ToString();
                 //the MAC address which has "PCI" and not has "Wireless" is ethernet MAC
                 if (strDescription.Contains("PCI") && !strDescription.Contains("Wireless"))
                     strMAC = adapter.GetPhysicalAddress().ToString();

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//Namespace reference
using System.Management;
/// <summary>
/// Returns MAC Address from first Network Card in Computer
/// </summary>
/// <returns>MAC Address in string format</returns>
public string FindMACAddress()
    //create out management class object using the
    //Win32_NetworkAdapterConfiguration class to get the attributes
    //af the network adapter
    ManagementClass mgmt = new ManagementClass("Win32_NetworkAdapterConfiguration");
    //create our ManagementObjectCollection to get the attributes with
    ManagementObjectCollection objCol = mgmt.GetInstances();
    string address = String.Empty;
    //loop through all the objects we find
    foreach (ManagementObject obj in objCol)
        if (address == String.Empty)  // only return MAC Address from first card
            //grab the value from the first network adapter we find
            //you can change the string to an array and get all
            //network adapters found as well
            if ((bool)obj["IPEnabled"] == true) address = obj["MacAddress"].ToString();
        //dispose of our object
    //replace the ":" with an empty space, this could also
    //be removed if you wish
    address = address.Replace(":", "");
    //return the mac address
    return address;

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static string GetMacAddress()
  string macAddresses = "";
  foreach (NetworkInterface nic in NetworkInterface.GetAllNetworkInterfaces())
    // Only consider Ethernet network interfaces, thereby ignoring any
    // loopback devices etc.
    if (nic.NetworkInterfaceType != NetworkInterfaceType.Ethernet) continue;
    if (nic.OperationalStatus == OperationalStatus.Up)
      macAddresses += nic.GetPhysicalAddress().ToString();
  return macAddresses;


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