Aggiungere i file di progetto.

OMControl/Form1.cs

@@ -0,0 +1,46 @@
+using System.IO.Ports;
+
+namespace OMControl
+{
+    public partial class Form1 : Form
+    {
+        private SerialPortWatcher _watcher;
+        public Form1()
+        {
+            InitializeComponent();
+            this.Load += Form1_Load;
+
+        }
+        
+
+        private void Form1_Load(object sender, EventArgs e)
+        {
+            listBoxPorts.Items.Clear();
+            foreach (var p in SerialPort.GetPortNames())
+                listBoxPorts.Items.Add(p);
+
+            // start watcher
+            _watcher = new SerialPortWatcher(1000);
+
+            _watcher.PortsAdded += ports => BeginInvoke(() =>
+            {
+                foreach (var p in ports)
+                    if (!listBoxPorts.Items.Contains(p))
+                        listBoxPorts.Items.Add(p);
+            });
+
+            _watcher.PortsRemoved += ports => BeginInvoke(() =>
+            {
+                foreach (var p in ports)
+                    listBoxPorts.Items.Remove(p);
+            });
+
+            _watcher.Start();
+        }
+        protected override void OnFormClosing(FormClosingEventArgs e)
+        {
+            _watcher?.Dispose();
+            base.OnFormClosing(e);
+        }
+    }
+}