hello,
i have gotten my code running well. it collect the network card information
by way of Win32_networkadapterconfiguration but when it comes to the
DNSDomain output i'm get null. always null.
i run the ipconfig /all and there is data. but using the win32_... i get null.

int i = 0;
bool bStat = false;
ManagementObjectSearcher query = new ManagementObjectSearcher("SELECT * FROM
Win32_NetworkAdapterConfiguration WHERE IPEnabled = 'TRUE'");
ManagementObjectCollection queryCollection = query.Get();
i = queryCollection.Count;
string[] addresses;
foreach (ManagementObject snic in queryCollection)
{
   XHF.defInst.xprhotfixviewer.Text += "NIC Name:     " + "\t" +
snic["Description"] + "\r\n";
   XHF.defInst.xprhotfixviewer.Text += "MAC Address:  " + "\t" +
snic["MACAddress"] + "\r\n";
   if (snic["IPAddress"] != null)
   {
       addresses = (string[])snic["IPAddress"];
       foreach (string ipaddress in addresses)
       {
           XHF.defInst.xprhotfixviewer.Text += "IP Address:   " + "\t" +
ipaddress + "\r\n";
       }
   }
   else
       XHF.defInst.xprhotfixviewer.Text += "IP Address:   " + "\t";
   XHF.defInst.xprhotfixviewer.Text += "DHCP Server:  " + "\t" +
snic["DHCPServer"] + "\r\n";
   XHF.defInst.xprhotfixviewer.Text += "DNS Domain:   " + "\t" +
snic["DNSDomain"] + "\r\n";

according to documentation this is a "string".