Convert C# in VB 2005

private void Form1_FormClosing(object sender, FormClosingEventArgs e)
 
{
 
if (serialPort1.IsOpen)
 
{
 
e.Cancel = true; //cancel the fom closing
 
Thread CloseDown = new Thread(new ThreadStart(CloseSerialOnExit)); //close port in new thread to avoid hang
 
CloseDown.Start(); //close port in new thread to avoid hang
 
}
 
}
 
private void CloseSerialOnExit()
 
{
 
try
 
{
 
serialPort1.Close(); //close the serial port
 
}
 
catch (Exception ex)
 
{
 
MessageBox.Show(ex.Message); //catch any serial port closing error messages
 
}
 
this.Invoke(new EventHandler(NowClose)); //now close back in the main thread
 
}
 
private void NowClose(object sender, EventArgs e)
 
{
 
this.Close(); //now close the form
 
}