Help with xml parsing!

I'm having trouble figuring out how to read and write xml, could someone possible provide sample xml and code to parse it so I can understand it more? Is it possible to parse the xml from a textbox?

Code:

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        'write out
        Dim myXMLDocument As XDocument = XDocument.Parse(TextBox1.Text)
        myXMLDocument.Save("C:\somefile.xml")

        'read in
        TextBox1.Text = XDocument.Load("C:\somefile.xml").ToString

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Of course you would want to use proper error handling in the event an error were to occur.