private void rptLoaiThiNghiemBind()
        {
            rptLoaiThiNghiem.DataSource = DAO.clsLoaiThiNghiemDAO.getListLoaiThiNghiem();
            rptLoaiThiNghiem.DataBind();
            DAO.clsCotThiNghiem_Mapping CTN = new DAO.clsCotThiNghiem_Mapping();
            DataTable TableCTN = CTN.getFullCotThiNghiem();

            foreach (RepeaterItem item in rptLoaiThiNghiem.Items)
            {
                Repeater CotTN      = item.FindControl("rptCotThiNghiem") as Repeater;
                Label    ID         = item.FindControl("lblID_LoaiThiNghiem") as Label;
                Button   btnThemCot = item.FindControl("btn_ThemCot") as Button;
                DataView t          = new DataView(TableCTN);
                btnThemCot.Visible = true;
                t.RowFilter        = "ID_LoaiThiNghiem=" + ID.Text;
                if (t.Count == 4)
                {
                    btnThemCot.Visible = false;
                }
                CotTN.DataSource = t;
                CotTN.DataBind();
                if (t.Count > 0)
                {
                    Button btnXoa = CotTN.Items[t.Count - 1].FindControl("btn_XoaCot") as Button;
                    btnXoa.Visible = true;
                }
            }
        }
        protected void btn_ThemLoaiThiNghiem_Click(object sender, EventArgs e)
        {
            DAO.clsCotThiNghiem_Mapping CTNDAO = new DAO.clsCotThiNghiem_Mapping();
            int lastID = DAO.clsLoaiThiNghiemDAO.insertThiNghiemNewLastID();

            if (CTNDAO.insertNew(lastID))
            {
                Response.Redirect(Request.RawUrl);
            }
        }