Adding new node to existing XmlDocument object

Question

I have an xml of following format.

    
        
        author 1             


        

Answer 1

XmlDocument doc = new XmlDocument();
doc.Load("file.xml");
XmlElement foo = doc.CreateElement("foo");
XmlElement bar = doc.CreateElement("bar");
bar.InnerText = "whatever";
foo.AppendChild(bar);
doc.DocumentElement.AppendChild(foo);
doc.Save("file.xml");

see Martin Honnen Post at: Adding a new Node to existing XML document