Accessing Hardware in Silverlight using COM

using System;
using System.Runtime.InteropServices.Automation;
using System.Windows;
using System.Windows.Controls;

namespace SilverlightApplication1
{
    public partial class MainPage : UserControl
    {
        dynamic m_ComDrawerContoller;
        AutomationEvent m_DrawerChangeEventHandler;

        public MainPage()
        {
            InitializeComponent();

            // the COM object will only be successfully created if the application is currently running
            // out of browser and in elevated trust.
            if (Application.Current.IsRunningOutOfBrowser && Application.Current.HasElevatedPermissions)
            {
                RegisterComObject();
            }
        }

        private void RegisterComObject()
        {
            try
            {
                // Create the object.  If ProgId attribute is not added to the COM class, the 
                // string to use is assembly.class
                m_ComDrawerContoller = AutomationFactory.CreateObject("ComExample.Application");
                
                // Creates an object to manage the event from the com object.
                m_DrawerChangeEventHandler = AutomationFactory.GetEvent(m_ComDrawerContoller, "DrawerStateChange");

                // Adds a handler for the event actually being raised.
                m_DrawerChangeEventHandler.EventRaised += new EventHandler<AutomationEventArgs>(HandleDrawerStateChange);
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message);
            }
        }

        /// <summary>
        /// Handles the click from any of the "Open Drawer x" buttons.
        /// The drawer number is in the tag property of the button.
        /// </summary>
        private void Button_Click(object sender, RoutedEventArgs e)
        {
            int drawerNumber = Convert.ToInt32(((Button)sender).Tag);
            m_ComDrawerContoller.OpenDrawer(drawerNumber);
        }

        private void btnReset_Click(object sender, RoutedEventArgs e)
        {
            m_ComDrawerContoller.CloseAllOpenDrawers();
        }

        /// <summary>
        /// Handles the event raised by the com object.  
        /// </summary>
        private void HandleDrawerStateChange(object sender, AutomationEventArgs e)
        {
            switch ((int)e.Arguments[0])
            {
                case 1:
                    Drawer1Status.Text = (bool)e.Arguments[1] ? "Open" : "Closed";
                    break;
                
                case 2:
                    Drawer2Status.Text = (bool)e.Arguments[1] ? "Open" : "Closed";
                    break;
                case 3:
                    Drawer3Status.Text = (bool)e.Arguments[1] ? "Open" : "Closed";
                    break;
            }
        }

        private void check_click(object sender, System.Windows.RoutedEventArgs e)
        {
        	int drawerNumberToCheck;
			int.TryParse(txtDrawerToCheck.Text, out drawerNumberToCheck);

            if (drawerNumberToCheck > 0)
            {
                bool isOpen = m_ComDrawerContoller.IsDrawerOpen(drawerNumberToCheck);

                if (isOpen) lblCheckStatus.Text = "Open"; else lblCheckStatus.Text = "Closed";
            }
			
        }
    }
}