private void button3_Click(object sender, EventArgs e)

        {

            if (textBox1.Text.Length < 5)

            {

                MessageBox.Show("被监控的客户端IP地址不允许空", "确信正确", MessageBoxButtons.OK);

                return;

            }

            Program.order_string = "LOCK";

            rev_thread.send_monitor_to_client(comboBox1.Text, textBox1.Text);

        }

        private void button4_Click(object sender, EventArgs e)

        {

            if (textBox1.Text.Length < 5)

            {

                MessageBox.Show("被监控的客户端IP地址不允许空", "确信正确", MessageBoxButtons.OK);

                return;

            }

            Program.order_string = "UNLOCK";

            rev_thread.send_monitor_to_client(comboBox1.Text, textBox1.Text);

        }

        private void button5_Click(object sender, EventArgs e)

        {

            if (textBox1.Text.Length < 5)

            {