✅ Can you lock or freeze a thread while using another form in a new thread??

 private void DeviceInsertedEvent(object sender, EventArrivedEventArgs e)
        {
            // Update Interface to recognise USB inserted
            lblUSBDetection.Text = "-- USB Inserted";

            string serialNumber;

            // Retrieve Serial Number from USB Device
            ManagementBaseObject instance = (ManagementBaseObject)e.NewEvent["TargetInstance"];

            foreach (var s in instance.Properties)
            {
                //Output all properties and values to debug console window for testing
                //Debug.WriteLine(s.Name + " = " + s.Value);

                if (s.Name == "PNPDeviceID")
                {
                    string[] strings = s.Value.ToString().Split('\\');
                    serialNumber = strings[2];
                    Debug.WriteLine(serialNumber);
  
                    if (serialNumber != null)
                    {
                        //TODO if staement to show form  if Serial matches serial stored in the data base, for now open form for all USB devices
                        new Thread(() => new USBPopup(serialNumber).ShowDialog()).Start();
                    }
                    break;
                }
            }
        }