>>780
string xmlstr = "<root>・・・（省略）・・・</root>";
XPathDocument doc = new XPathDocument(new StringReader(xmlstr));
XPathNavigator nav = doc.CreateNavigator();
XPathExpression exp = nav.Compile("/root/data");
XPathNodeIterator nodes = nav.Select(exp);
while (nodes.MoveNext()) {
Console.WriteLine(nodes.Current.ToString());
}
こうかな？まあ、XPathを使う。