How to change or replace the xml node value and attribute value/

create a hidden text field of the original text compare with the availability in xml file and then update






private void updateDocument()
    {
        StringBuilder sb = new StringBuilder();
        string strFileName = "Testimonial2.xml";

        string pathStr = Server.MapPath("");
        if (Directory.Exists(pathStr) == false)
        {
            Directory.CreateDirectory(pathStr);
        }
        string direcPath = pathStr + "\\Testimonial2.xml";
        if (File.Exists(direcPath) == true)
        {
            XmlDocument doc;
            try
            {
                doc = new XmlDocument();
                doc.Load(direcPath);
                doc.Save(direcPath);
            }
            catch (Exception ex)
            {
            }
            finally
            {

            }

            try
            {

                doc = new XmlDocument();
                doc.Load(direcPath);
                XmlNode oldChild = doc.SelectSingleNode("Poems/Poems[content = '" + txtcontenthidden.Text + "']");
                foreach (XmlNode node1 in oldChild.ChildNodes[0])
                {
                    oldChild.ChildNodes[0].InnerText = txtContent.Text;
                    oldChild.ChildNodes[3].InnerText = DateTime.Now.ToShortDateString();
                }
                doc.Save(direcPath);
                bindTest();
                lblerror.Text = " ";
                txtContent.Text = "";
                btnContent.Text = "Add Testimonial";
                btnContent.CommandName ="Add Testimonial";
                btndelete.Visible = false;

            }
            catch (Exception ex)
            {
                throw ex;
            }
            finally
            {
                //  fsReadXml.Close();
            }
        }
    }