My XML document will not save changes made to the document

you remove the location in your codes. Like below:

XmlDocument XMLdoc = new XmlDocument();
                string XMLfilename = "PasswordHoldDoc.xml";
                XMLdoc.Load(XMLfilename);
                XmlNode root = XMLdoc.DocumentElement;
                String pwdNode = root.FirstChild.InnerText;
                //XmlNode pwdNode = XMLdoc.SelectSingleNode("/directory/password");
                if (pwdNode != null)
                {
                    root.FirstChild.InnerText = passwordConfirmTextbox.Text;
                   
                    // Only use Save method, 
                    XMLdoc.Save();
                    MessageBox.Show("done!");

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