The FindDNSServer.cs program

using System;
using Microsoft.Win32;
class FindDNSServers
{
  public static void Main()
  {
   RegistryKey start = Registry.LocalMachine;
   string DNSservers = @"SYSTEM\CurrentControlSet\Services\Tcpip\Parameters";
   RegistryKey DNSserverKey = start.OpenSubKey(DNSservers);
   if (DNSserverKey == null)
   {
     Console.WriteLine("Unable to open DNS servers key");
     return;
   }
   string serverlist = (string)DNSserverKey.GetValue("NameServer");
   Console.WriteLine("DNS Servers: {0}", serverlist);
   DNSserverKey.Close();
   start.Close();
   char[] token = new char[1];
   token[0] = ' ';
   string[] servers = serverlist.Split(token);
   foreach(string server in servers)
   {
     Console.WriteLine("DNS server: {0}", server);
   }
  }
}