Writing Back to an XML document via Visual Studio 2005

How would I go about doing that?
I know how to read the xml file via the xml data object, however how could I set this up so I could write back to it?

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I use this to check the config for the server and database. It finds the node I want,  checks the value of each item, writes an new value and then saves.

Dim Node As System.Xml.XmlNode
       For Each Node In XmlDocument.Item("configuration").Item("appSettings")
            If Node.Name = "add" Then ' skip any comments
                If Node.Attributes.GetNamedItem("key").Value = "CurrentValue" Then
                    conServer = Node.Attributes.GetNamedItem("value").Value
                    If conServer = "" Then
                        conServer = "NewValue"
                        Node.Attributes.GetNamedItem("value").Value = conServer
                    End If
                 End If
             End If
        Next Node


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