multiple file upload in gridview

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ASP.NET

hello all,
i have one gridview.
in that i have facebook type comment system that in each row user can post comments on that data.
now with comment i want one more facility to attach multiple files.
like in one row,i can post comment and along with it i can attach files also.and after attaching files those attached file will be downloadable in that row only.
like wise other user can give comment and attach his files.
is there any solution to this.
i can do this using single file uploader.but i want it as multiple file uploader