How to access attribute values, which are now in an xml string format..

            string str = "your xml string";
            XDocument document = XDocument.Parse(str);
            var books = document.Descendants("book");
            foreach (XElement item in books)
            {
                var idElement = item.Element("id");
                if (idElement.HasAttributes)
                {
                    XAttribute attr = idElement.Attribute("isPrimaryKey");
                    string attrValue = attr.Value;
                    Console.WriteLine(attrValue);
                }
            }
            Console.Read();

<?xml version="1.0" encoding="utf-8"?>
<books>
<book>
	<id isPrimaryKey="true">3785</id>
        <name>CLR via C#</name>
</book>
</books>