the code below is what i researched and found on the net that should work,
but its not. i am not getting any errors but the current user logon name
still does not appear in the text box. can someone help me. thanks!

public void OnLoad(DocReturnEvent e)
        {
            // Populates UserName in field.
            IXMLDOMNode UserNameNode =
thisXDocument.DOM.selectSingleNode("dfs:myFields/dfs:mydataFields/d:UserName");
            if (UserNameNode!=null)
            {
                if (UserNameNode.text=="")
                {
                    UserNameNode.text = System.Environment.UserName;
                }
            }
        }