using System;
using System.Windows.Forms;
using System.Runtime.InteropServices;
namespace WindowsApplication1
... {
public partial
class Form1 : Form
... {
public Form1()
... {
InitializeComponent();
}
private void Form1_Load( object sender, EventArgs e)
... {
Win32Hook hook = new Win32Hook();
hook.onMouseChange += new EventHandler(hook_onMouseChange);
hook.SetHook();
} 
void hook_onMouseChange( object sender, EventArgs e)
... {
this .Text = Cursor.Position.ToString();
}
}
public class Win32Hook
... {
[DllImport( " kernel32 " )]
public static
extern
int GetCurrentThreadId();

[DllImport( " user32 " ,CharSet = CharSet.Auto, CallingConvention = CallingConvention.StdCall)]
public static
extern
int SetWindowsHookEx(
HookType idHook,
HOOKPROC lpfn,
int hmod,
int dwThreadId);
public enum HookType
... {
WH_GETMESSAGE = 3
} 
public delegate
int HOOKPROC( int nCode, int wParam, int lParam);

public event System.EventHandler onMouseChange;

public void SetHook()
... {
SetWindowsHookEx(HookType.WH_GETMESSAGE,
new HOOKPROC( this .MyKeyboardProc),
0 ,
GetCurrentThreadId());
} 
public int MyKeyboardProc( int nCode, int wParam, int lParam)
... {
if (onMouseChange != null )
... {
onMouseChange( null , null );
}
return 0 ;
}
}
}