bool _setStaticIP(string static_ip)
        {
            bool ret   = false;
            int  count = 0;

            //get logsytem
            var    prop_logsystem = testingInfo.GetType().GetProperty("logSystem");
            string log_value      = (string)prop_logsystem.GetValue(testingInfo);

            //set static ip
            log_value += string.Format("\n-------------------------------\n");
            log_value += string.Format("{0}, set static ip\n", DateTime.Now);
            prop_logsystem.SetValue(testingInfo, log_value);
            count = 0;
RE_SET:
            count++;
            ret = camera.setStaticIP(static_ip);
            if (!ret)
            {
                if (count < 3)
                {
                    goto RE_SET;
                }
            }

            return(ret);
        }