fill tooltip from database for radiobuttonlist?

Question

i am using below code to fill radio list from database. i want tooltip for all radio buttion. but it outtonnly display tooltip for first radiobutton. and remain same for all radiobuttons.

 private void FillCHKFacility()

    {

        try

        {

            sq = new SQLDataAccessHelper();

            SqlParameter[] param = new SqlParameter[1];

            param[0] = new SqlParameter("@facilityid", SqlDbType.Int);

            param[0].Value = DBNull.Value;

            ds = new DataSet();

            ds = sq.ExecuteDataSet("usp_FillFacility", param);

            if ((ds != null) && (ds.Tables.Count != 0) && (ds.Tables[0].Rows.Count != 0))

            {

                rblFacility.Items.Clear();

                rblFacility.DataSource = ds;

                rblFacility.DataTextField = "FacilityName";

                rblFacility.DataValueField = "FacilityId";

               // rblFacility.ToolTip = "NoOfSeats";

                rblFacility.DataBind();

                rblFacility.Items.Insert(0, "All");

                rblFacility.SelectedIndex = 0;

                rblFacility.ToolTip = ds.Tables[0].Rows[0]["NoOfSeats"].ToString();

            }