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SerialPort serialPort = new SerialPort()                    

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serialPort.BaudRate = baudRate;
serialPort.DataBits = dataBits;
serialPort.StopBits = stopBits;
serialPort.Parity = parity;
serialPort.PortName = portName;
serialPort.Open()                    

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serialPort.DataReceived -= new SerialDataReceivedEventHandler(OnPort_DataReceived);                    

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       protected override void WndProc(ref Message m)
        {
            // call the base class WndProc for default message handling
            base.WndProc(ref m);    
            try
            {
                if (mDetector != null)
                {
                    mDetector.WndProc(ref m);   //call WndProc(ref System.Windows.Forms.Message m)
                }

            }
            catch (InvalidCastException ex)
            //catch (Exception ex)
            {
                MessageBox.Show(ex.Message, "Error", MessageBoxButtons.OK, MessageBoxIcon.Stop);

                //throw new System.NotImplementedException();
            }
        }                    

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"System.UnauthorizedAccessException wurde nicht behandelt.
  Message="Der Zugriff auf den Anschluss wurde verweigert."
  Source="System"
  StackTrace:
       bei System.IO.Ports.InternalResources.WinIOError(Int32 errorCode, String str)
       bei System.IO.Ports.InternalResources.WinIOError()
       bei System.IO.Ports.SerialStream.Dispose(Boolean disposing)
       bei System.IO.Ports.SerialStream.Finalize()
  InnerException:                    

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serialPort.DataReceived -= new SerialDataReceivedEventHandler(OnPort_DataReceived);                    

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GC.SuppressFinalize(serialPort);                    

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try
{
  GC.Collect();
}
catch
{
}                    

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      private void OnDriveChanged(object sender, PortDetectorEventArgs e)
        {
/* not relevant
            // Report the event in the listbox.
            rtfData.AppendText(DateTime.Now.ToLongTimeString() + " USB COM PORT " + e.Drive + "\n");
            ArrayList arrayList = PortDetector.returnArrayList;   //read global List
            viewPortListArray(arrayList);
*/
            if (e.Drive == "Removed") //&& serialPort.IsOpen)
            {
                serialPort.Close();
                [b]serialPort.Dispose();[/b]
            }
        }                    

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    /// <summary>
    /// Required designer variable.
    /// </summary>
    private System.ComponentModel.IContainer components = null;

    /// <summary>
    /// Clean up any resources being used.
    /// </summary>
    /// <param name="disposing">true if managed resources should be disposed; otherwise, false.</param>
    protected override void Dispose(bool disposing)
    {
        if (disposing && (components != null))
        {
            components.Dispose();
        }
        base.Dispose(disposing);
    }