public void setIP () {
    ManagementClass objMC = new ManagementClass("Win32_NetworkAdapterConfiguration");
    ManagementObjectCollection objMOC = objMC.GetInstances();

    foreach (ManagementObject objMO in objMOC) {
        if (!(bool) objMO["IPEnabled"]) {
            continue;
        } else if ((String) objMO["ServiceName"] != "msloop") {
            continue;
        }

        try {
            ManagementBaseObject objNewIP = objMO.GetMethodParameters("EnableStatic");
            ManagementBaseObject objNewGate = objMO.GetMethodParameters("SetGateways");

            objNewIP["IPAddress"] = new string[] { "110.110.110.1" };
            objNewIP["SubnetMask"] = new string[] { "255.255.255.252" };

            objNewGate["GatewayCostMetric"] = new string[] { "1" };

            objMO.InvokeMethod("EnableStatic", objNewIP, null);
            Console.WriteLine("EnableStatic End");
            objMO.InvokeMethod("SetGateways", objNewGate, null);
            Console.WriteLine("SetGateways End");

            Console.WriteLine("Change OK");
            Console.WriteLine("==================================================================");
        } catch (Exception ex) {
            MessageBox.Show("Unable to Set IP : " + ex.Message);
        }
    }
}