how to insert ..... in .rtf file and show in richtextbox

Question

Hi all ,
 
i have a some problem in  window application C# Project.so plz help me for that..i am sending my details requirement to you.
plz try to understand my problem and plz send code as much as possible.
 
requirement:- there is a RTF file is save in any Drive. in this RTF file there is 4-5 Paragrph. i have need to read this file paragraph and show it in richtextbox control in window form with <p> and <\p> and with every paragraph.
means to say, if RTF file 4-5 paragraph then he show in richtextbox with every paragrpah with <p> aaaaaaaaaaa<\p>.
like that...
<p>aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa<\p>
<p>bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb<\p>
<p>wwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwww<\p>.
 
so plz help me for that..requirement before 29 oct.
 
Clue:- i have did only to show RTF file content to richtextbox in form only..i have no idea about how to insert <p>,<\p>
with every paragraph.