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copied!<p>You should be able to do these simultaneously (assuming that's ok). You would then close them as the <code>DataReceived</code> event is raised (extraneous code removed). Just don't close the port in <code>CheckPorts</code>.</p> <pre><code>private void testSerialPort_DataReceived(object sender, SerialDataReceivedEventArgs e) { SerialPort localSerialPort = sender as SerialPort; ... // use localSerialPort instead of global/class variable if (localSerialPort.IsOpen) { localSerialPort.Close(); } } </code></pre> <p><strong>EDIT</strong>: Responding to comment.</p> <p>You can always add a timer on the fly. If you put this in the foreach loop, you'll get a timer for every serial port that will dispose its given serial port after 3 seconds. It's important here that the timer is declared within the foreach loop.</p> <pre><code>var interval = 3000; // ms var timer = new System.Timers.Timer(interval); timer.Elapsed += (o,e) => { timer.Enabled = false; if (testSerial.IsOpen) testSerial.Close(); // may not be necessary with Dispose? testSerial.Dispose(); timer.Dispose(); } timer.Enabled = true; </code></pre> <p><strong>EDIT</strong>: Code updated so I'll update</p> <p>Scope is very important with the code I provided. You should get rid of the non-local testSerial or use an entirely different name here.</p> <pre><code> portNumber = Int32.Parse(s.Remove(0, 3)); // MUST BE LOCAL var serialOneOfMany = new SerialPort(s, baudRate, Parity.None, 8, StopBits.One); serialOneOfMany.ReadTimeout = 2000; serialOneOfMany.WriteTimeout = 2000; if (serialOneOfMany.IsOpen) { serialOneOfMany.Close(); } // timer must be defined _after_ serialOneOfMany var interval = 3000; // ms var timer = new System.Timers.Timer(interval); timer.Elapsed += (o, e) => { timer.Enabled = false; if (serialOneOfMany.IsOpen) serialOneOfMany.Close(); // may not be necessary with Dispose? serialOneOfMany.Dispose(); timer.Dispose(); }; </code></pre>

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