How to add new element below existing element using xml Document

Question

I have an element Name \"Dispute\" and want to add new element name \"Records\" below the element.
Eg: The current XML is in this format

Answer 1

XmlDocument doc = new XmlDocument();
doc.Load("input.xml");

XmlElement records = doc.CreateElement("Records");
records.InnerText = Guid.NewGuid().ToString();
doc.DocumentElement.AppendChild(records);

doc.Save("output.xml"); // if you want to overwrite the input use doc.Save("input.xml");