Programmer - Comparing folder current state with saved prior state

Programmer Question

I want to make a winform application that tells you whenever you open it all the changes that have been made since last opening, and maybe record a log of it, such as:

• File/folder creations


• File/folder renamings


• File/folder exclusions

I've figured i have to do three tasks:

• Save the folder state (tree) in a
  reloadable format


• Load this information back


• Compare this information with current
  state gathered on-the-go


• List changes, log and display them

I've come up with some ideas, what have you got to help me ?

(I'm using C#, vs 08 and .NET 3.5)

Find the answer here