XML Select Single Node

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Ref http://msdn.microsoft.com/en-us/library/h0hw012b.aspx
<pre> <bookstore xmlns="http://www.lucernepublishing.com">
<book>
<title>Pride And Prejudice</title>
</book>
</bookstore>
</pre>

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

     //Create an XmlNamespaceManager for resolving namespaces.
     XmlNamespaceManager nsmgr = new XmlNamespaceManager(doc.NameTable);
     nsmgr.AddNamespace("bk", "urn:samples");

     //Select the book node with the matching attribute value.
     XmlNode book;
     XmlElement root = doc.DocumentElement;
     book = root.SelectSingleNode("descendant::book[@bk:ISBN='1-861001-57-6']", nsmgr);

     Console.WriteLine(book.OuterXml);

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