listing port number and connected device to the listBox ?

try
          {
              ManagementObjectCollection mReturn;
              ManagementObjectSearcher mSearch;
              mSearch = new ManagementObjectSearcher("Select * from Win32_SerialPort");
              mReturn = mSearch.Get();
              foreach (ManagementObject mObj in mReturn)
              {
                  numberList.Items.Add(mObj["Caption"].ToString());
              }
          }
          catch (Exception t)
          {

          }