Hi,

   here is the modified code. Check it out and let us know the result.

protected void Button1_Click(object sender, EventArgs e)
        {
            try
            {
                XmlTextReader reader = new XmlTextReader(Server.MapPath("~/XML/XMLFile3.xml"));
                XmlDocument doc = new XmlDocument();
                doc.Load(reader);
                reader.Close();
                XmlNode currNode;
                XmlDocumentFragment docfrag = doc.CreateDocumentFragment();
                docfrag.InnerXml = "<cd country=\"" + TextBox1.Text + "\">" +
               "<title>" + TextBox2.Text + "</title>" +
               "<artist>" + TextBox3.Text + "</artist>" +
                "<price>" + TextBox4.Text + "</price>" +
                "</cd>";
                currNode = doc.DocumentElement;
                currNode.InsertAfter(docfrag, currNode.LastChild);
                doc.Save(Server.MapPath("~/XML/XMLFile3.xml"));
            }
            catch (Exception ex)
            {

                Console.WriteLine("Exception: {0}", ex.ToString());
            }
            LoadXmlData();
        }