XMLDocument reading CDATA and Commnets

Question

Hi
can i read CDATA in This way ....................? 

 
   XmlDocument doc = new XmlDocument();

  doc.Load(Server.MapPath("~/App_Data/XMLFile.xml"));

        XmlNodeList listnode = doc.GetElementsByTagName("book");

        foreach (XmlNode node in listnode)

        {

            if (node is XmlCDataSection)

            {

                Response.Write("CDATA i s"+node.innerText);

            }

        }

And

Can i read Commnets in this way.................?

   foreach (XmlNode node in listnode)

        {

            if (node is XmlComment)

            {

                Response.Write("Commnets are"+node.InnerText);

            }

        }