How to write the Codeing to create the Forums

Hi.,
  I am suresh .,
    i would like to know how to design and do the code to create the forums.,Like posting the question and adding the reply to that post.
 can any one give the idea how to do.
i want to design like this formats:
http://forums.asp.net/t/1082365.aspx
http://forums.asp.net/p/1264029/2524736.aspx#2524736
http://www.myarchn.com/notes/FAQ_Forum
Left side photo.
righrside post message.,
reply button.


please can any one help me.,
Thank's
Suresh K

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