Append elements and attributes to an XML file

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XML

C#3.5

I have an XML file as below

<?xml version="1.0"?>
<equipments>
  <equipment name="DA-001">
    <plant>Brazil</plant>
  </equipment>
  <equipment name="VERIGY-93K_PSL-032">
    <plant>Brazil</plant>
  </equipment>
  <equipment name="BA-1500-002">
    <plant>Muar</plant>
  </equipment>
</equipments>

I need to append items to this XML via some C# code, however I cannot append and retaining same XML format

XmlDocument doc = new XmlDocument();
doc.Load(history);

XmlNode equipment = doc.CreateElement("equipment");
XmlAttribute name = doc.CreateAttribute("name");
name.Value = textBox.Text;
equipment.Attributes.Append(name);
doc.DocumentElement.AppendChild(equipment);

XmlNode plant = doc.CreateElement("plant");
plant.InnerText = cmbPlant.SelectedItem.ToString();
doc.DocumentElement.AppendChild(plant);
doc.Save("Equipment.xml");

The above code is appending as follows: Notice that the plant should be in the equipment node and the equipment is not being closed as the previous XML contents.

<?xml version="1.0"?>
<equipments>
  <equipment name="DA-001">
    <plant>Brazil</plant>
  </equipment>
  <equipment name="VERIGY-93K_PSL-032">
    <plant>Brazil</plant>
  </equipment>
  <equipment name="BA-1500-002">
    <plant>Muar</plant>
  </equipment>
  <equipment name="This_Equipment_added" />
  <plant>USA</plant>
</equipments>