private delegate void UpdateStatusDelegate(string status);        private void UpdateStatus(string status)        {            this.textBox1.Text = status;        }

 private void OnBtUsbRead(object sender, EventArgs e)        {            Thread t = new Thread(new ThreadStart(Go));            t.Start();   // Run Go() on the new thread.            Go();        // Simultaneously run Go() in the main thread.         }        private  void Go()        {            this.BeginInvoke(new UpdateStatusDelegate(UpdateStatus), new object[] { "123"});        }