Mostrar nombre de los puertos

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using System.IO.Ports; // No olvidar.
namespace Nombre_COM
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
private void Form1_Load(object sender, EventArgs e)
{
// Añado los puertos disponible en el PC con SerialPort.GetPortNames() al combo
try
{
comboBox_Puerto.DataSource = SerialPort.GetPortNames();
}
catch
{
MessageBox.Show("No encuentra ningún puerto físico ni virtual.", "Aviso:",
MessageBoxButtons.OK, MessageBoxIcon.Warning);
}
// Añado los puertos disponible en el PC con SerialPort.GetPortNames() al combo
comboBox_Puerto.DataSource = SerialPort.GetPortNames();
// // Añade puertos disponibles físicos y virtuales.
serialPort1.PortName = comboBox_Puerto.Text.ToString();
}
// Detecta USB o puerto serie virtual cuando lo conecta y desconecta del cable.
protected override void WndProc(ref Message USB)
{
if (USB.Msg == 0x219)
{
comboBox_Puerto.DataSource = SerialPort.GetPortNames();
}
base.WndProc(ref USB); // Detecta si hay cambios en el usb y si los hay los refleja.
}
private void button_Conectar_Click(object sender, EventArgs e)
{
try
{
serialPort1.PortName = comboBox_Puerto.Text.ToString(); // Puerto seleccionado previamente.
serialPort1.Open(); // Abrir puerto.
comboBox_Puerto.Enabled = false;
button_Conectar.Enabled = false;
button_Desconectar.Enabled = true;
}
catch
{
MessageBox.Show("El puerto no existe.", "Aviso:",
MessageBoxButtons.OK, MessageBoxIcon.Warning);
}
}
private void button_Desconectar_Click(object sender, EventArgs e)
{
serialPort1.Close(); // Cerrar puerto.
comboBox_Puerto.Enabled = true;
button_Conectar.Enabled = true;
button_Desconectar.Enabled = false;
}
private void Form1_FormClosing(object sender, FormClosingEventArgs e)
{
if (serialPort1.IsOpen) // ¿El puerto está abierto?
{
serialPort1.Close(); // Cerrar puerto.
}
}
}
}

Con WMI:

Código

using (var searcher = new ManagementObjectSearcher
    ("SELECT * FROM WIN32_SerialPort"))
{
    string[] portnames = SerialPort.GetPortNames();
    var ports = searcher.Get().Cast<ManagementBaseObject>().ToList();
    var tList = (from n in portnames
                join p in ports on n equals p["DeviceID"].ToString()
                select n + " - " + p["Caption"]).ToList();
 
    foreach (string s in tList)
    {
        Console.WriteLine(s);
    }
}

Fuente:
http://stackoverflow.com/questions/2837985/getting-serial-port-information

Yo lo haría así:

Código

Public Shared Function GetComFriendllyNames() As Dictionary(Of String, String)
 
    Dim spDict As New Dictionary(Of String, String)
 
    Using searcher As New ManagementObjectSearcher("root\CIMV2", "SELECT DeviceId,Caption FROM Win32_SerialPort")
 
        For Each manObj As ManagementObject In searcher.Get()
            spDict.Add(CStr(manObj("DeviceId")), CStr(manObj("Caption")))
        Next manObj
 
    End Using
 
    Return spDict
 
End Function

...

Código

Dim spInfoDict As Dictionary(Of String, String) = GetComFriendllyNames()
 
For Each sp As KeyValuePair(Of String, String) In spInfoDict
    Console.WriteLine(String.Format("Name: {0} | Desc.: {1}", sp.Key, sp.Value))
Next sp
 
Me.ComboBox1.DataSource = spInfoDict.Values.ToList

C#:

Código

public static Dictionary<string, string> GetComFriendllyNames()
{
 
	Dictionary<string, string> spDict = new Dictionary<string, string>();
 
	using (ManagementObjectSearcher searcher = new ManagementObjectSearcher("root\\CIMV2", "SELECT DeviceId,Caption FROM Win32_SerialPort")) {
 
		foreach (ManagementObject manObj in searcher.Get()) {
			spDict.Add(Convert.ToString(manObj("DeviceId")), Convert.ToString(manObj("Caption")));
		}
 
	}
 
	return spDict;
 
}
 
//=======================================================
//Service provided by Telerik (www.telerik.com)
//Conversion powered by NRefactory.
//Twitter: @telerik
//Facebook: facebook.com/telerik
//=======================================================

...

Código

Dictionary<string, string> spInfoDict = GetComFriendllyNames();
 
foreach (KeyValuePair<string, string> sp in spInfoDict) {
	Console.WriteLine(string.Format("Name: {0} | Desc.: {1}", sp.Key, sp.Value));
}
 
this.ComboBox1.DataSource = spInfoDict.Values.ToList();

Saludos