blog post application

Question

hi ,

i am creating a simple blog post application.For this i have created two tables .

1>tblBlogTopic( it contains the following fields: btopicId, btopicTitle, btopicDescription, bdatetime, empid)

2>tblBlogComment(it Contains the following fields:bCommentId,bCommentDescriptin, Empid, bcdatetime, btopicId )

In my application a user post his blog which will be seen in a list box. On selected index change of the listbox  it will show the details of the topic in a reapeater control . If somebody wants to post a comment on a particular blog he can comment which should also be displayed in a same repeater control.
What should i do for it. I am having a problem in posting comment on a same repeater control .

I am really having confusion about it. how can i create it . plz help me on how can i do this....thanks in advance.