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<root>
  <person>
    <name>C</name>
  </person>
  <person>
    <name>A</name>
  </person>
  <person>
    <name>B</name>
  </person>
</root>                    

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XPathNavigator navigator = document.CreateNavigator();
XPathExpression expression = navigator.Compile("/root/person");
expression.AddSort("name", XmlSortOrder.Ascending, XmlCaseOrder.LowerFirst, "", XmlDataType.Text);
XPathNodeIterator iterator = navigator.Select(expression);                    

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foreach(XPathNavigator node in iterator)
{
  if (node.MoveToNext())
  {
    nextNode = node;
    // informationen von nextNode holen...
    node = node.MoveToPrevious();
  }
  // weitere verarbeitung der aktuellen node
}                    

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IEnumerable<XPathItem> items = iterator.Cast<XPathItem>();