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Append An Element To An Existing XML File (VB.NET)

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Here's an example of appending a node to an xml file in VB.NET. 
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Dim doc As New XmlDocument()  
 Dim file As New FileStream("your_filename", FileMode.Open)  
 doc.Load(file)  
 Try  
      file.Close()  
      file.Dispose()  
      Dim root As XmlNode = doc.DocumentElement  
      Dim el As XmlElement = doc.CreateElement("Invoices", "http://schemas.openxmlformats.org/package/2006/Invoices")  
      el.SetAttribute("Id", "Test")  
      doc.DocumentElement.AppendChild(el)  
      root.InsertBefore(el, doc.DocumentElement.FirstChild)  
      doc.Save("your_filename")  
 Catch ex As Exception  
      Throw ex  
 End Try

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