My XML document will not save changes made to the document

Hello all,

I am building an application that will allow my user to change their password. Their password will be stored in an XML Document. Also, I plan on doing password reset based off of secret questions, stored in an XML document. My code steps-through without error, but the XML document remains unchanged.

In my properties for the XML file, I have tried to set "Copy to output" as "Copy Always", and "Copy if Newer", no luck.

My code for saving is as 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;
                   
                    XMLdoc.Save("PasswordHoldDoc.xml");
                    MessageBox.Show("done!");

-JG