private void btnClose_Click(object sender, EventArgs e)
{
int port;
port = cbxCOM.SelectedIndex + 1;
if (com.CloseComPort()) // close COM port
{
MessageBox.Show("Close COM" + port.ToString() + ": done!", "Close");
}
else
{
MessageBox.Show("Close COM" + port.ToString() + ": failed!", "Error");
}
btnClose.Enabled = false;
btnSend.Enabled = false;
SwitchEnable(true);
}