c# - Delete host from dns zone -

i trying delete host using below code selected zone not deleting.

     string query = "select * microsoftdns_zone containername = '" + zonename    + "' , ownername='" + recordname + "'";        objectquery qry = new objectquery(query);       managementscope scope = new managementscope(@"\\" + dnsservername + "\\root\\microsoftdns");       scope.connect();       managementobjectsearcher s = new managementobjectsearcher(scope, qry);             managementobjectcollection col = s.get();             foreach (managementobject obj in col)             {                 obj.delete();             } 

please help.

below code delete domain record.

 bool deleterecordfromdns(string zonename, string dnsservername, string recordname)     {         try         {             string query = string.format("select * microsoftdns_atype ownername = '{0}.{1}'", recordname, zonename);             objectquery qry = new objectquery(query);             managementscope scope = new managementscope(@"\\" + dnsservername + "\\root\\microsoftdns");             scope.connect();             managementobjectsearcher s = new managementobjectsearcher(scope, qry);             managementobjectcollection col = s.get();             if (col.count > 0)             {                 foreach (managementobject obj in col)                 {                     obj.delete();                 }                 return true;             }             else             {                 return false;             }          }         catch (exception)         {             return false;         }     }