How to Read/Write to XML file in .Net Compact Framework Using VB.Net

This is the structure of my file:
<?xml version="1.0" encoding="utf-8"?>
<Configuration>
  <ZipCode>11787</ZipCode>
  <RefreshRate>5000</RefreshRate>
</Configuration>

On my form I have two text boxes one for the zip code and the other for the refresh rate. What I would like to do is when the application loads the two text boxes are populated with the data from the xml file. I then have a Save button below the two text boxes. What I would like to do here is save the changes I made in the text boxes to the same xml file.

I am trying to create a Pocket PC application and this xml file is being used as a configuration file.

Thanks In Advance.
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thenrichConnect With a Mentor Commented:

 Dim xmlDoc As New Xml.XmlDataDocument
   xmlDoc.Load(Application.StartupPath & "\temp.xml")
   xmlDoc.GetElementsByTagName("ZipCode")(0).InnerXml = textbox.text
   xmlDoc.GetElementsByTagName("ZipCode")(0).InnerXml = RefreshRate
   xmlDoc.Save(Application.StartupPath & "\test.xml")
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