private void btnStart_Click(object sender, EventArgs e) { if (btnStart.Text == "Start") { adamGCL_IOMsg.Start_Server(); btnStart.Text = "Stop"; string strNowTime = DateTime.Now.ToString("hh:mm:ss:fff"); this.listBoxMsg.Items.Add(strNowTime); this.listBoxMsg.Items.Add("Start listening... "); this.listBoxMsg.Items.Add(""); } else { adamGCL_IOMsg.Stop_Server(); btnStart.Text = "Start"; } }