How To Generate And Consume Xml In C#

i have not worked with XML in a while can someone post the syntax needed to build and save an xml node structure that resembles that of a tree structure that is created by a recursive function.

basically i have a recursive function that saves data found an a page(url) and then follows each URL found on that page recursivley and does the same to it. to audit this i want an output as a xml file to disk so i can see how it is doing its recursion and parsing.

the code i have is below. please add to it the needed xml calls needed to create a xml structure like the one i show below. (please include the full name space so i can see where the objects i need in .net are for this.)

page1.htm has 2 links on it:

<a href=page1_1.htm>
<a href=page1_2.htm>

page1_1.htm has 2 links on it

<a href=page1_1_a.htm> (this then will have some links also)
<a href=page1_1_b.htm> (this then will have no more links on it - dead end)

the xml should do something like this:

<node url=page1.htm>
...<node url=page1_1_a.htm>
...... <node url="xxx.htm"/>
...... <node url="yyy.htm".>
... </node>
...<node url=page1_1_b.htm />
</node>