Event handling in class file in C# windows application
<p>I am using the class pasted below to listen for the keypress event <kbd>ctrl</kbd> + <kbd>alt</kbd> + <kbd>q</kbd>.
When I use the same code in a form, the event is firing and works well.
But I need to use this function in a class file and keep that running in a thread, so that whenever the user does <kbd>ctrl</kbd> + <kbd>alt</kbd> + <kbd>q</kbd>, I get a confirmation box.</p>

<p>Now the problem is, the keypress event is not firing!
Is there any other way to make this code run in the background using a thread without using a form?</p>

<pre><code>namespace sam1 
{
  class LogoutManager
  {
      public static DialogResult Result;
      public static int allow;

      public void LogoutMgr()
      {
          KeyboardHook hook = new KeyboardHook();
          hook.KeyPressed += new EventHandler&lt;KeyPressedEventArgs&gt;(hook_KeyPressed);
          hook.RegisterHotKey((ModifierKeys)2 | (ModifierKeys)1, Keys.Q);
      }

      void hook_KeyPressed(object sender, KeyPressedEventArgs e)
      {
          if (allow == 0)
          {
              allow = allow + 1;
              Result = MessageBox.Show("Are you sure, you want to log off?", "Log off"
                      , MessageBoxButtons.YesNo
                      , MessageBoxIcon.Warning);

              if (Result == DialogResult.Yes)
              {
                  allow = 0;
              }
              else
              {
                  allow = 0;
              }
          }
      }
  }
}
</code></pre>

<hr>

<pre><code>namespace sam1
{
    public sealed class KeyboardHook : IDisposable
{
    // Registers a hot key with Windows.
    [DllImport("user32.dll")]
    private static extern bool RegisterHotKey(IntPtr hWnd, int id, uint fsModifiers, uint vk);
    // Unregisters the hot key with Windows.
    [DllImport("user32.dll")]
    private static extern bool UnregisterHotKey(IntPtr hWnd, int id);

    /// &lt;summary&gt;
    /// Represents the window that is used internally to get the messages.
    /// &lt;/summary&gt;
    private class Window : NativeWindow, IDisposable
    {
        private static int WM_HOTKEY = 0x0312;

        public Window()
        {
            // create the handle for the window.
            this.CreateHandle(new CreateParams());
        }

        /// &lt;summary&gt;
        /// Overridden to get the notifications.
        /// &lt;/summary&gt;
        /// &lt;param name="m"&gt;&lt;/param&gt;
        protected override void WndProc(ref Message m)
        {
            base.WndProc(ref m);

            // check if we got a hot key pressed.
            if (m.Msg == WM_HOTKEY)
            {
                // get the keys.
                Keys key = (Keys)(((int)m.LParam &gt;&gt; 16) &amp; 0xFFFF);
                ModifierKeys modifier = (ModifierKeys)((int)m.LParam &amp; 0xFFFF);

                // invoke the event to notify the parent.
                if (KeyPressed != null)
                    KeyPressed(this, new KeyPressedEventArgs(modifier, key));
            }
        }

        public event EventHandler&lt;KeyPressedEventArgs&gt; KeyPressed;

        #region IDisposable Members

        public void Dispose()
        {
            this.DestroyHandle();
        }

        #endregion
    }

    private Window _window = new Window();
    private int _currentId;

    public KeyboardHook()
    {
        // register the event of the inner native window.
        _window.KeyPressed += delegate(object sender, KeyPressedEventArgs args)
        {
            if (KeyPressed != null)
                KeyPressed(this, args);
        };
    }

    /// &lt;summary&gt;
    /// Registers a hot key in the system.
    /// &lt;/summary&gt;
    /// &lt;param name="modifier"&gt;The modifiers that are associated with the hot key.&lt;/param&gt;
    /// &lt;param name="key"&gt;The key itself that is associated with the hot key.&lt;/param&gt;
    public void RegisterHotKey(ModifierKeys modifier, Keys key)
    {
        // increment the counter.
        _currentId = _currentId + 1;

        // register the hot key.
        if (!RegisterHotKey(_window.Handle, _currentId, (uint)modifier, (uint)key))
            throw new InvalidOperationException("Couldn’t register the hot key.");
    }

    /// &lt;summary&gt;
    /// A hot key has been pressed.
    /// &lt;/summary&gt;
    public event EventHandler&lt;KeyPressedEventArgs&gt; KeyPressed;

    #region IDisposable Members

    public void Dispose()
    {
        // unregister all the registered hot keys.
        for (int i = _currentId; i &gt; 0; i--)
        {
            UnregisterHotKey(_window.Handle, i);
        }

        // dispose the inner native window.
        _window.Dispose();
    }

    #endregion
}

/// &lt;summary&gt;
/// Event Args for the event that is fired after the hot key has been pressed.
/// &lt;/summary&gt;
public class KeyPressedEventArgs : EventArgs
{
    private ModifierKeys _modifier;
    private Keys _key;

    internal KeyPressedEventArgs(ModifierKeys modifier, Keys key)
    {
        _modifier = modifier;
        _key = key;
    }

    public ModifierKeys Modifier
    {
        get { return _modifier; }
    }

    public Keys Key
    {
        get { return _key; }
    }
}

/// &lt;summary&gt;
/// The enumeration of possible modifiers.
/// &lt;/summary&gt;
[Flags]
public enum ModifierKeys : uint
{
    Alt = 1,
    Control = 2,
    Shift = 4,
    Win = 8
}

}
</code></pre>
