Not quite. XML is just a file-based text file after all. But you can do with XML (or XML code libraries) same things: get/put/update/delete data.

You decide if you need XML in your project.
...

Now, where's your XML?

Anyway, first make a function to test "Is Bigger Than x"

Public Function IsBigger(ByVal OneLine As String, ByVal x As Integer) As Boolean
'
Dim TempStr As String

If...

The best way to get started is to do some googling.

Reading XML files:
http://www.google.com/search?q=VB.NET+read+XML+file

writing XML files:...