multi level reply / comment functionality in asp.net

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ASP.NET

i made social networking site where i want multi level reply option(reply to reply at N level),

Just like code project,
where we post reply on comment and then other user also reply us....and so on ....at N level,


what we have done so far is,

I take a table name tbl_Comment, and in this table i take two coloum, name as
1. Ans_id and
2. father_id,

then i have two cash:
1. if comment on answer i took ans_id,
2. and if reply on comment i took, comment id as father id and ans_id took zero,


So when i display that,data i take two nested grid view, 1st grid view bind comment on Answer, and inner grid view bind reply on comment where Ans_id is zero,

But it bind data only at one level, after this what can i do for N level binding data,

And i also want that second level reply is just below of 1st level reply,

What can i do ?

Plz help.................