This code demonstrates how to append an XML document. We will add a new element and some inner text. Call the function, provide arguments for the path to the file, the name of the child node, the element name, and the text to add. The file is opened, appended, and saved. The function returns a true if it succeeds and a false if it fails. This is the before and after of the pageLinks.xml file. before:


  http://www.google.com

after:


  http://www.google.com
  http://www.yahoo.com

I'm using the "button 2" click event to call the function...

    Private Sub Button2_Click(ByVal sender As System.Object, _
        ByVal e As System.EventArgs) Handles Button2.Click
        Dim myFilePath = _
        "C:\pageLinks.xml"
        Dim mybool As Boolean = saveToXMLDoc("http://yahoo.com", _
        myFilePath, "linkList", "link")
    End Sub

The function is called....

    Private Function saveToXMLDoc(ByVal textToAdd As String, _ 
         ByVal filePath As String, ByVal xNode As String, _ 
         ByVal addedElement As String) As Boolean
        Dim success As Boolean
        Try
            'create place for the document in memory and load it with an existing doc
            Dim xmlLinksDoc As XmlDocument = New XmlDocument
            xmlLinksDoc.Load(filePath)
            Dim xmlNavigator As Xml.XPath.XPathNavigator = xmlLinksDoc.CreateNavigator
            xmlNavigator = xmlNavigator.SelectSingleNode(xNode)  
            'xNode is the node we are adding a new child to
            'example: xmlNavigator = nav.SelectSingleNode("linkList")
            xmlNavigator.AppendChildElement("", addedElement, "", textToAdd) 
            'adds the element (addElement) and the text (textToAdd)
            'example: xmlNavigator.AppendChildElement("", "textHolder", "", "This is the text that will be added to the 'textHold' node.")
            xmlLinksDoc.Save(filePath)
            success = True
        Catch ex As Exception            
            success = False
        End Try
        Return success
    End Function

Dynamically append an XML document