problem in saving tree view nodes in a xml file

[fa_2064]

i have a big problem and dont know how can i solve it???
my problem is this: i want to save dynamic changes in tree view control
nodes in a xml file,
what is my solution?????????
and how can determine that a node insert/delete in/from a specially
node that checked???

any sample is useful for me...

thanks in advance
i am waitting...:-((((((