private void writeIpAddrToTextFile(string ipaddress)
        {
            if (kryptonComboBoxControllerIp.Items.Contains(ipaddress))
            {
                kryptonComboBoxControllerIp.Items.Remove(ipaddress);
            }
            kryptonComboBoxControllerIp.Items.Insert(0, ipaddress);
            kryptonComboBoxControllerIp.SelectedIndex = 0;

            TxtFile IpFile = new TxtFile("deviceIp.txt");
            IpFile.clearFile();

            foreach (object o in kryptonComboBoxControllerIp.Items)
            {
                IpFile.writeFile(o.ToString());
            }
        }
        private void readIpAddrToTextFile()
        {
            TxtFile IpFile = new TxtFile("deviceIp.txt");
            ArrayList IpArrayList = IpFile.readFile();
            foreach (object o in IpArrayList)
            {
                kryptonComboBoxControllerIp.Items.Add(o.ToString());
            }
            if (kryptonComboBoxControllerIp.Items.Count == 0)
                kryptonComboBoxControllerIp.Items.Add("192.168.1.242");

            kryptonComboBoxControllerIp.SelectedIndex = 0;
        }