friendly port name combobox c# Windows Form VS2013

Question

 I have a question about friendly name I read a lot (really a lot) about how to get the friendly name. I even used the WMICodeCreator I have a code to put. But actually I don't understand how to add this to my combobox menu. here under is my code. Actually this one is showing the available COM port on the computer, but I would like to show the friendlyname of this one to make my application easier to use. How can I do to display friendlyname instead of "COMx" by using this?

ManagementObjectSearcher is making error when I'm using it  (even if I'm adding using System.Management;)

 

I'm using Windows Form application on C#.

 public partial class Form1 : Form

{

    private SerialPort myport;

    public Form1()

{

   InitializeComponent();

    myport = new SerialPort();

  }

private void portbox_DropDown(object sender, EventArgs e)

{

   string[] ports = SerialPort.GetPortNames();

   portbox.Items.Clear();

  

foreach (string port in ports)

{

    portbox.Items.Add(port);

}

}

private void butvalidate_Click(object sender, EventArgs e)

{

myport.BaudRate = 9600;

myport.PortName = portbox.SelectedItem.ToString();

myport.Open(); }

In advance thanks for your help, I'm kinda news in coding that why I'm asking.