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; }