sql server & xml

Hello,

I have created a database in Microsoft sql server express 2008 and I need to present the information in a treeview. I opted for the xml method, however I need the file to be updated so that the treeview can reflect any new data entered or any other changes made in the DB. I already know how to generate the xml file but I am not sure how to dynamically update the file. Is there another way of doing this? I know with the xml file I can manipulate the presentation of the data in the file which is very important for the treeview. If there is an alternative, how will I be able to manipulate the presentation of the data? Any suggestions will be appreciated.

The following are details on the programs and OS being used:
Programs
Sql Server 2008 Express
Sql Server Management Studio

OS: Windows 7 Home 64 bit

If there are any links or books with information that you can recommend that will be a great help since I am a novice!

Thanks
Millette