Using WMI. Only need to return one MAC Address but foreach loop is returning many

I'm creating a C# Console application using WMI and the NetworkAdapter Win32 API to pull the MAC Address from a number of computers. However, I'm trying to re-write the code to only grab the "main" MAC Address. Not any virtual addresses. After performing tests on a multitude of Workstations, it appears that the first MAC in the return list is the original but I want to be sure.
Below is the code. I'm trying to figure out how to incorporate the "for" statement to just get the original MAC Address. How would I go about doing that?
Much appreciated,
Wally
ConnectionOptions mgmtConn = new ConnectionOptions();
            mgmtConn.Impersonation = ImpersonationLevel.Impersonate;
            mgmtConn.Authentication = AuthenticationLevel.Packet;
 
ManagementScope scope = new ManagementScope();
 
scope = new ManagementScope("\\root\\cimV2", mgmtConn);
scope.Connect();
 
ObjectQuery queryNA = new ObjectQuery("SELECT * FROM Win32_NetworkAdapter");
 
ManagementObjectSearcher objNaSearcher = new ManagementObjectSearcher(scope, queryNA);
 
foreach (ManagementObject objQueried in objNaSearcher.Get())
            {
                Console.WriteLine("------------------------------------");
                Console.WriteLine("Win32_NetworkAdapter instance");
                Console.WriteLine("------------------------------------");
                Console.WriteLine("MAC Address: {0}", objQueried["MACAddress"]);
            }
 
            Console.ReadLine();

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wally_davisAsked:
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wally_davisConnect With a Mentor Author Commented:
I needed to add the ManagementOptions "Username" and "Password" options and then also discovered I needed to pass in the Domain\Username correctly using the correct path (and not an escape sequence character).
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Bob LearnedCommented:
Hmmm...great question...I believe what you need to do is to check the PhysicalAdapter property, but that only appears to be visible with Vista.

Win32_NetworkAdapter Class
http://msdn.microsoft.com/en-us/library/aa394216(VS.85).aspx

PhysicalAdapter
Data type: boolean
Access type: Read-only

PhysicalAdapter
Data type: boolean
Access type: Read-only

Indicates whether the adapter is a physical or a logical adapter. If True, the adapter is physical.

Windows Server 2003, Windows XP, Windows 2000, and Windows NT 4.0:  This property is not available.
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grayeCommented:
They way that I distinguish them is by looking at the PnPDeviceID field...  if it starts with "ROOT" then it's not a physical device.
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wally_davisAuthor Commented:
I appreciate the suggested recommendations and will look to potentially incorporate some of those ideas.
However, the root of my problem is getting through to the remote computer in order to start pulling back data.
I tried another test that indicates that there are no Firewall or DCOM issues. I go to Computer Management, right-click on the "Computer Management (Local)" icon, select "Connect to another computer", change to the computer name, and voila, I'm in. So, connecting to WMI on another machine works. Just not in my code. Any suggestions one where the potential cause might be would be great. :)
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grayeCommented:
Tell us a bit more about your scenario...  WinXP?  Active Directory Domain?
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wally_davisAuthor Commented:
I'll be running this executable eventually from an Windows 2003 Server that runs SQL. We're going to be running some checks on data from SQL and of course, I need to be able to get this data into the Database first before we run some other processes.
The Remote workstations I will need to connect to are XP SP2 and Vista. Any other information let me know.
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wally_davisAuthor Commented:
Oh, and yes, the Server and the workstations are in an Active Directory Domain environment.
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