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 ManagementClass objMC = new ManagementClass(
                 "Win32_NetworkAdapterConfiguration");
            ManagementObjectCollection objMOC = objMC.GetInstances();


            foreach (ManagementObject objMO in objMOC)
            {

                if (!(bool)objMO["IPEnabled"])
                    continue;

                try
                {

                    ManagementBaseObject objNewDNS = null;
                    ManagementBaseObject objSetDNS = null;

                    //Set DNS
                    objNewDNS = objMO.GetMethodParameters("SetDNSServerSearchOrder");
                    objNewDNS["DNSServerSearchOrder"] = new string[] { "192.168.16.238", "192.168.16.239" };
                    for (int i = 0; i <= this.DNS.Length; i++)
                    {
                        Console.WriteLine("Set DNS " + this.DNS[i]);
                    }
                    objSetDNS = objMO.InvokeMethod("SetDNSServerSearchOrder", objNewDNS, null);

                }
                catch (Exception ex)
                {
                    throw new Exception("Unable to Set IP : " + ex.Message);
                }                    

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Der index ist ausserhalb des Arraybereichs....