How to set the NIC's IP to dynamic

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C#

IP

Hi everyone

I'm a c# newby who want to learn more about programming. So I started with a simple tool, wich can set the address of a choosen network adapter to static or dynamic (like the Windows TCP/IP Properties. Setting a static IP address to the network adapter works pretty good. But when I disconnet the Computer form the network and then set the network adapter's IP to dynamic (Obtain an IP address automatically"), it won't set the Windows IP Propertie to dynamic. I understand that I only get an IP address automatically, when I'm connected to a network (where a router or a DHCP server is enabled). But when I disconnect the computer form the network, an I set the IP Properties to dynamic with the the Windows TCP/IP Properties, it works well. What is worng in my code?

Thanks for your help!

Below the code I'm using:

public void setDHCPMode()
   {
       ManagementClass mc = new ManagementClass("Win32_NetworkAdapterConfiguration");
       ManagementObjectCollection moc = mc.GetInstances();

       foreach (ManagementObject mo in moc)
       {
           if (!(bool)mo["ipEnabled"])
               continue;

           try
           {
               string desc = (string)(mo["Description"]);

               if (desc == NICcomboBox.Text)
               {
                   ManagementBaseObject newDNS = mo.GetMethodParameters("SetDNSServerSearchOrder");
                   newDNS["DNSServerSearchOrder"] = null;
                   ManagementBaseObject enableDHCP = mo.InvokeMethod("EnableDHCP", null, null);
                   ManagementBaseObject setDNS = mo.InvokeMethod("SetDNSServerSearchOrder", newDNS, null);
               }

               toolStripStatusLabel1.Text = "DHCP set";
           }
           catch (Exception ex)
           {
               MessageBox.Show("Unable to set DHCP : " + ex.Message);
           }
       }
   }