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				  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 = "CLOSEPC"; 
            rev_thread.send_monitor_to_client(comboBox1.Text, textBox1.Text); 
        } 
  
        private void button6_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 = "RESTART"; 
            rev_thread.send_monitor_to_client(comboBox1.Text, textBox1.Text); 
        } 
  
        private void button7_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 = "NO LINK"; 
            rev_thread.send_monitor_to_client(comboBox1.Text, textBox1.Text); 
        } 
  
        private void button8_Click(object sender, EventArgs e) 
        { 
            if (textBox1.Text.Length < 5) 
            { 			
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