How to create a windows registry watcher?

How to create a windows registry watcher application using .Net,

I want this application to watch all the registry hocks and fire an event when a value change, this event will tell the old and new value for that value.

Thats possible? how? need just the idea or where to start

From stackoverflow

• Take a look at RegistryMonitor - a .NET wrapper class for RegNotifyChangeKeyValue.

• This looks like a good place to start. There is a WMI class for the registry.

  Amr ElGarhy : Using WMI classes for registry i can get the old and new values after a key change?

  JP Alioto : Still looking but does not look good ... you might have to go with the win32 wrapper method that cletus suggested.

• .Net framework does not contain embedded class to watch the registry. But you still can use wrapped WinAPI calls or WMI interface (see example)