appending an xml from vb.net

Experts

I am attempting to append a new entry to an xml file that stores connections, however when I write the new data to the xml file is does not wuite add it to the correct place within the xml file.  The file I am appending is as below:

<?xml version="1.0" encoding="UTF-8"?>
<MTTConfig>
  <configList software="Haulage">
    <companyConfig>
      <companyName>Joes Garage</companyName>
      <dbServerConfig>
        <dbServer>PostgreSQL</dbServer>
        <serverAddress>localhost</serverAddress>
        <port>5432</port>
        <database>mtt</database>
        <user>postgresmtt</user>
      </dbServerConfig>
    </companyConfig>
    <companyConfig>
      <companyName>test 1</companyName>
      <dbServerConfig>
        <dbServer>PostgreSQL</dbServer>
        <serverAddress>ip add</serverAddress>
        <port>5432</port>
        <database>mtt</database>
      </dbServerConfig>
    </companyConfig>
    <companyConfig>
      <companyName>Freds Garage</companyName>
      <dbServerConfig>
        <dbServer>PostgreSQL</dbServer>
        <serverAddress>ipadd</serverAddress>
        <port>5432</port>
        <database>mtt</database>
        <user>postgresmtt</user>
      </dbServerConfig>
    </companyConfig>
    <companyConfig>
      <companyName>Bills Garage</companyName>
      <dbServerConfig>
        <dbServer>SQLServer</dbServer>
        <serverAddress>127.0.0.1</serverAddress>
        <port>1433</port>
        <database>MTT</database>
        <misc>Trusted_Connection=false</misc>
      </dbServerConfig>
    </companyConfig>
    <companyConfig>
      <companyName>Alfs Garage</companyName>
      <dbServerConfig>
        <dbServer>PostgreSQL</dbServer>
        <serverAddress>ipadd</serverAddress>
        <port>5432</port>
        <database>mtt</database>
        <user>mtt1</user>
      </dbServerConfig>
    </companyConfig>
  </configList>
 <companyConfig>
    <companyName>test</companyName>
    <serverAddress>765675</serverAddress>
    <port>8768</port>
    <database>mtt</database>
  </companyConfig>
</MTTConfig>

The part I have just appended is the last lot of company details after </configList>, these details should be added before the </configList> however.  I can not seem do do this.  .net code I am using is as below, perhaps by looking at this you can point me int he right direction.

  Dim xmldoc As New XmlDocument
            xmldoc.Load(gc.HmDir & "Company2.xml")

            Dim xmlEl As XmlElement = xmldoc.CreateElement("companyConfig")
            xmldoc.DocumentElement.AppendChild(xmlEl) 'Append to company config collection

            Dim xmlChildEl As XmlElement
            xmlChildEl = xmldoc.CreateElement("companyName")
            Dim xmlText As XmlText = xmldoc.CreateTextNode(con_txt.Text)
            xmlChildEl.AppendChild(xmlText)
            xmlEl.AppendChild(xmlChildEl)

            xmlChildEl = xmldoc.CreateElement("serverAddress")
            xmlChildEl.AppendChild(xmldoc.CreateTextNode(srv_txt.Text))
            xmlEl.AppendChild(xmlChildEl)

            xmlChildEl = xmldoc.CreateElement("port")
            xmlChildEl.AppendChild(xmldoc.CreateTextNode(port_txt.Text))
            xmlEl.AppendChild(xmlChildEl)

            xmlChildEl = xmldoc.CreateElement("database")
            xmlChildEl.InnerText = db_txt.Text
            xmlEl.AppendChild(xmlChildEl)

            xmldoc.Save(gc.HmDir & "Company2.xml")

Regards

Chas