XML Excetption

Hi

I am using xml in this way and also reading in right but when i add CDATA and reading it giving me exception but why i don't know can any one help me...?

how can i read at a time cdata and attributes ...?



Xml file is


 
   

      prakash nagar
      begumpet
      hyderabad
      andhra pradesh
   

 
 
   

      srnagar
      ameerpet
      hyderabad
      andhra pradesh
   

 
 
   
   

      anna salai
      t nagar
      chennai
      tamilnadu
   

   
 




Cs File is
  protected void Button1_Click(object sender, EventArgs e)
    {
        XmlDocument doc = new XmlDocument();
        doc.Load(Server.MapPath("~/XMLFile.xml"));
        //XmlNodeList node = doc.GetElementsByTagName("Books");
        XmlNode node = doc.DocumentElement;
        foreach (XmlNode cnode in node)
        {
            if (cnode.HasChildNodes)
            {
                foreach (XmlNode ChildNode in cnode.ChildNodes)
                {
                    Response.Write("
Child node is" + cnode.InnerText + "
"+cnode.NodeType);
                    foreach (XmlAttribute nodeAttribute in ChildNode.Attributes) //Excetptio occured here...// Object reference not set to an instance of an object.
                    {


                        Response.Write("
Attributes is" + nodeAttribute.InnerXml + "
");
                    }
                    ////Response.Write("
Child node is"+cnode.InnerText+"
");
                }
                if (cnode is XmlCDataSection)
                {
                    XmlCDataSection cdatasection = cnode as XmlCDataSection;
                    Response.Write("
CDATA" + cdatasection.InnerText + "
");
                }
               
            }
           
            //Response.Write(cnode.InnerText);
        }
    }