how to gridview selected column visible false

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ASP.NET

i have one gird .in that two link button i.e Accept ,Reject..
when i click on accept then i want to do reject linkbutton visible false of that perticular row...
not for all row so how can i do???
plz help me..

my code is below:-

LinkButton lb = (LinkButton)e.CommandSource;
       if (e.CommandName.Equals("accept"))
       {
           string[] commandArgs = e.CommandArgument.ToString().Split(new char[] { ',' });
           int profileid = Convert.ToInt32(commandArgs[0]);
           int friendID = Convert.ToInt32(commandArgs[1]);

           SysATGlobal.DB.ExecuteSelectQuery("update DSMailBox.HDR_GROUP set ACCEPT_STATUS=1  where PROFILE_ID='" + profileid + "' and FRIEND_ID='" + friendID + "'",true);
           lb.Text = "Request Accept successfully";
           GrdATDataView.Columns[2].Visible = false;



       }
       else
       {
           string[] commandArgs = e.CommandArgument.ToString().Split(new char[] { ',' });
           int profileid = Convert.ToInt32(commandArgs[0]);
           int friendID = Convert.ToInt32(commandArgs[1]);


            SysATGlobal.DB.ExecuteSelectQuery("update DSMailBox.HDR_GROUP set REJECT_STATUS=1 where PROFILE_ID='" + profileid + "' and FRIEND_ID='" + friendID + "'",true);
            lb.Text = "Request Rejected";
            GrdATDataView.Columns[1].Visible = false;

       }