Installing a global hot key with C# by Christian Liensberger This is the code posted here: <http://www.liensberger.it/web/blog/?p=207>. The blog post got html escaped which required some tweaks to get working so I posted it here to save others time.

KeyboardHook.cs

using System;
using System.Collections.Generic;
using System.Text;
using System.Runtime.InteropServices;
using System.Windows.Forms;

namespace Liensberger
{
    /// <summary>
    /// Author: Christian Liensberger
    /// Class from: http://www.liensberger.it/web/blog/?p=207
    /// </summary>
    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);
        /// <summary>
        /// Represents the window that is used internally to get the messages.
        /// </summary>
        private class Window : NativeWindow, IDisposable
        {
            private static int WM_HOTKEY = 0x0312;

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

            /// <summary>
            /// Overridden to get the notifications.
            /// </summary>
            /// <param name="m"></param>
            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 >> 16) & 0xFFFF);
                    ModifierKeys modifier = (ModifierKeys)((int)m.LParam & 0xFFFF);

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

            public event EventHandler<KeyPressedEventArgs> 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);
            };
        }

        /// <summary>
        /// Registers a hot key in the system.
        /// </summary>
        /// <param name="modifier">The modifiers that are associated with the hot key.</param>
        /// <param name="key">The key itself that is associated with the hot key.</param>
        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.");
        }

        /// <summary>
        /// A hot key has been pressed.
        /// </summary>
        public event EventHandler<KeyPressedEventArgs> KeyPressed;

        #region IDisposable Members

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

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

        #endregion


        /// <summary>
        /// Event Args for the event that is fired after the hot key has been pressed.
        /// </summary>
        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; }
            }
        }

        /// <summary>
        /// The enumeration of possible modifiers.
        /// </summary>
        [Flags]
        public enum ModifierKeys : uint
        {
            None = 0,
            Alt = 1,
            Control = 2,
            Shift = 4,
            Win = 8
        }
    }
}

so nice of you..its verry good........