Delete XML node with XPATH

[spunkywacko]

If someone could help me I'd be extremely grateful!
Thank you! :) :) :)

Here is my xml:

<?xml version="1.0" encoding="utf-8"?>
<quotes>
  <quote>
    <name>Bob</name>
    <id>2</id>
  </quote>
  <quote>
    <name>Bob2</name>
    <id>4</id>
  </quote>
</quotes>

I am using this to try and delete the entire 'quote' node that contains the id of value 4.

XmlDocument doc = new XmlDocument();
                doc.Load("contosoBooks.xml");
                XPathNavigator navigator = doc.CreateNavigator();
                XPathExpression expression;
                expression = navigator.Compile("/quotes/quote[id=4]");
                XPathNodeIterator Iterator = navigator.Select(expression);

                while (Iterator.MoveNext())
                {
                    navigator.DeleteSelf();

                    
                }

                doc.Save("bob.xml");

But I get: Operation is not valid due to the current position of the navigator....
If their is a better way to delete an xml node please do tell :(

Thank you sooooo much!