DataGrid + XML problem

Hi,

I am working on datagrid and a xml file (not asp or database).
I am trying to do Add/Delete data from the datagrid, and update it to the xml file.
I assume that user can modify data from the datagrid, and press "Save" to save the xml file.

I don't know how to do the update, because most examples are updating the database (asp), and i can't find any windows form stuff.

Thanks for all the help =)

Btw, if possible.... can anyone tell me if it is possible to link the xml file to a List Box (instead of datagrid)...

MANY MANY THANKS...

Panda.
:(