How set thread count Parallel.ForEach

Parallel.ForEach(list,
new ParallelOptions { MaxDegreeOfParallelism = 10 },
                () => Thread.CurrentThread.ManagedThreadId,
                (i, loopState, threadId) =>
                {
                    var cells = i.Split(';');
                    var ip = cells[0];
                    var login = cells[1];
                    var pass = cells[2];
                    try
                    {
                        using (var client = new SshClient(ip, login, pass))
                        {
                            client.Connect();
                            var port = new ForwardedPortLocal("localhost", 10000 + (uint)threadId, "ya.ru", 80);
                            port.Start();
                            client.AddForwardedPort(port);
                            newList.Add(ip);
                            port.Stop();
                            client.Disconnect();
                        }
                    }
                    catch
                    {


                    }

                    return threadId;
                },
                (t

hreadId) => { }