asp.net中如何通过 WmiMonitorID查询显示器序列号?

protected void Page_Load(object sender, EventArgs e)
    {
        String Mycpu = "";


//CPU
        ManagementObjectSearcher CPU = new ManagementObjectSearcher("SELECT Name FROM Win32_Processor");

        foreach (ManagementObject MyObject in CPU.Get())
        {

            try
            {

                Mycpu = String.Format(MyObject["Name"].ToString());

            }

            catch { }

        }
        showcpu.Text = Mycpu;

         //显示器
        ManagementObjectSearcher disp = new ManagementObjectSearcher("SELECT * FROM WmiMonitorID");

        foreach (ManagementObject MyObject in disp.Get())
        {

            try
            {

                Mydisplay = String.Format(MyObject["SerialNumberID"].ToString());

           }
      

            catch { }

        }
      showdisplay.Text = Mydisplay;