TPLINK MODEL NO MA180 is not connected to the port

Question

I have a send sms application and  it works fine with the mobiles phones which comes with PC Suit case , but when i Connect TPLINK MODEL NO MA 180 it is not showing the port and gives error as below "ERROR WHILE CONNECTION TO GSM PHONE MODEM " 

 

private void button9_Click(object sender, EventArgs e)

{

//Setting the column grid for fetched data

dataGridView3.ColumnCount = 5;

dataGridView3.Columns[0].Name = "COM Port";

dataGridView3.Columns[1].Name = "Connected Device";

dataGridView3.Columns[2].Name = "Max Baud Rate";

dataGridView3.Columns[3].Name = "Time Out";

dataGridView3.Columns[4].Name = "Status";

dataGridView3.AutoSizeColumnsMode = DataGridViewAutoSizeColumnsMode.DisplayedCells;

try

{

Cursor.Current = Cursors.WaitCursor;

ManagementObjectSearcher searcher = new ManagementObjectSearcher("root\\CIMV2", "SELECT * FROM Win32_SerialPort");

foreach (ManagementObject queryObj in searcher.Get())

{

if (queryObj != null)

{

object captionObj = queryObj["DESCRIPTION"];

object capdeviceid = queryObj["DEVICEID"];

object MaxBaudRate = queryObj["MAXBAUDRATE"];

object connstatus = queryObj["STATUS"];

string timeoutsec = "100";

dataGridView3.Rows.Add(capdeviceid, captionObj, MaxBaudRate, timeoutsec, connstatus);

}

}

}

catch (Exception e15)

{

MessageBox.Show("An error occurred while querying for WMI data: " + e15.Message);

}

Cursor.Current = Cursors.Default;

button9.Enabled = false;

button10.Enabled = true;

}

is there any reference or namespace missed for using the root/CIMV2 below are the namespaces added into my project 

using System;

using System.Collections.Generic;

using System.ComponentModel;

using System.Data;

using System.Drawing;

using System.Text;

using System.Windows.Forms;

using GsmComm.GsmCommunication;

using GsmComm.Interfaces;

using GsmComm.PduConverter;

using GsmComm.Server;

using System.IO;

using System.Data.OleDb;

using System.Management;

using System.Data.SqlClient;