c# - Set DNS to 'Obtain automatically' programmatically -

using c# on .net, how set dns servers 'obtain automatically'? can set ip addresses desired values this.

managementclass mclass = new managementclass("win32_networkadapterconfiguration"); managementobjectcollection mobjcol = mclass.getinstances(); foreach (managementobject mobj in mobjcol) {   if ((bool)mobj["ipenabled"])   {      managementbaseobject mbodns = mobj.getmethodparameters("setdnsserversearchorder");      if (mbodns != null)      {         //assume x.x.x.x , x.x.x.x ips.         string[] sips = { "x.x.x.x", "x.x.x.x" };         mbodns["dnsserversearchorder"] = sips;         mobj.invokemethod("setdnsserversearchorder", mbodns, null);      }   } } 

i've tried setting both ips null, sips = { null, null };, ends not changing settings @ all.

try setting dnsserversearchorder null instead of using array of null strings.

managementclass mclass = new managementclass("win32_networkadapterconfiguration"); managementobjectcollection mobjcol = mclass.getinstances(); foreach (managementobject mobj in mobjcol) {   if ((bool)mobj["ipenabled"])   {      managementbaseobject mbodns = mobj.getmethodparameters("setdnsserversearchorder");      if (mbodns != null)      {         mbodns["dnsserversearchorder"] = null;         mobj.invokemethod("setdnsserversearchorder", mbodns, null);      }   } }