how to encript a node value in xml file

hi i have xml  file as shown in below :-
<?xml version="1.0" encoding="ISO-8859-1"?> -<note> <to>Tove</to> <from>Jani</from> <heading>Reminder</heading> <body>Don't forget me this weekend!</body> <to>Tove</to> <from>Jani</from> <heading>Reminder</heading> <body>Don't forget me this weekend!</body> </note> i have field called <name> Jani</name>  i want to encrypt this filed in the xml file using c#. how to do this, i may have n number of <name> fileds in xml file
 
Thanks in advance
in the above xml i have node called <from>jani</from>
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