void ConnectCOMClick(object sender, EventArgs e)
{
Button connect = (Button)sender;
if (connect.Text == "connect")
{
// previously disconnected
string comPort = string.Empty;
try {
comPort = comboBoxSelectCOM.SelectedItem.ToString();
} catch {
MessageBox.Show(text: "connect SDS011 and select COM port", caption: "COM list error", buttons: MessageBoxButtons.OK);
}
if (comPort != string.Empty)
{
bool connectionEstablished = sds011.tryConnectCOM(comPort);
if (connectionEstablished)
{
sds011.startThread();
connect.Text = "disconnect";
connect.BackColor = Color.LightGreen;
}
}
else /* something went wrong, refresh and connect again */ } {
}