public bool connect(string ip, int port)
    {
        TcpClient tcpClient = new TcpClient();

        try
        {
            tcpClient.Connect(ip, port);
            return true;
        }
        catch
        {
            return false;
        }
        finally
        {
            tcpClient.Close();
        }
    }

    private void Form1_Shown(object sender, EventArgs e)
    {
        List<string> listPath1 = new List<string>();
        List<string> listPath2 = new List<string>();

        GetAllPaths(treeView1.Nodes[0].Nodes[0], listPath1);
        GetAllPaths(treeView1.Nodes[0].Nodes[1], listPath2);

        listPath1.RemoveAt(0);
        listPath2.RemoveAt(0);

        string[] tmp1 = listPath1.ToArray();
        string[] tmp2 = listPath2.ToArray();

        List<Thread> ThrArr = new List<Thread>();
        string[] tmp;

        for (int i = 0; i < tmp1.Length; i++) {
            tmp = tmp1[i].Split(' ');
            int temp = i;
            Thread devthread = new Thread(() => connect(tmp[1], Convert.ToInt32(tmp[4])));

            devthread.Name = "thr" + i.ToString();
            ThrArr.Add(devthread);
            //devthread.Start();
            //Thread.Sleep(10);
        }

        foreach (Thread thread in ThrArr)
        {
            thread.Start();
            treeView1.Nodes.Add("Potok" + thread.Name);
        }
    }