how do I read a external xml file in vb.net 2005 web app?

I have a web application and need to read values from a xml file with logon info for sap. I have no idea where to begine, but all i need to do is read the values and put them in variables in vb.net like below. I appreciate the help!

//vb.net variables
SYSTEM = varaible read from xml file
CLIENT = varaible read from xml file
USER = varaible read from xml file
PASSWORD = varaible read from xml file
LANGUAGE = varaible read from xml file
APPLICATION_SERVER = varaible read from xml file
SYSTEM_NUMBER = varaible read from xml file
HOST_NAME = varaible read from xml file
NO_DATA = varaible read from xml file

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Below is an example of populating variables from an XML file.

I made up a very simple XML file and saved it as c:\TestXMLFile.xml (see the content below). I then made a VB web page and use only 1 button and the debugger.

In the button click event, I demonstrate how to populate string variables by either selecting a single value from the XML document or by iterating a set of values. You can see http://www.developer.com/xml/article.php/10929_3383961_1 for more detail on the XPATH you will need to supply to navigate your XML document.

<?xml version="1.0" encoding="utf-8"?>
<root>
<logons>
<logon>
<system>MySystem</system>
<client>MyClient</client>
<user>MyUser</user>
<password>MyPassword</password>
</logon>
<logon>
<system>OtherSystem</system>
<client>OtherClient</client>
<user>OtherUser</user>
<password>OtherPassword</password>
</logon>
</logons>
</root>

   Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
 
        Dim doc As XmlDocument = New XmlDocument()
 
        doc.Load("c:/TestXMLFile.xml")
 
        Dim nodeList As XmlNodeList
 
        Dim root As XmlElement = doc.DocumentElement
 
        Dim userValue As String
        Dim passwordValue As String
 
        ' Example: Find the password when you know the user
        userValue = root.SelectSingleNode("//logon[user='MyUser']/password").InnerXml
 
        ' Step through all users
        nodeList = root.SelectNodes("//user")
        Dim user As XmlNode
 
        For Each user In nodeList
            userValue = user.InnerXml
            'Add your logic here as needed
        Next
 
        'Example of getting logon information from the XML
        nodeList = root.SelectNodes("//logon[user='OtherUser']")
        Dim logon As XmlNode
 
        'You can select one or iterate the results.  Below iterates (the single) result
        For Each logon In nodeList
            passwordValue = logon.SelectSingleNode("password").InnerXml
            userValue = logon.SelectSingleNode("user").InnerXml
            'Add your logic here as needed
        Next
 
    End Sub

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