/// <summary>
        /// Delete Update Bảng
        /// </summary>
        public bool Delete(Entities.ChiTietPhieuTTCuaKH ctpttncc1)
        {
            try
            {
                bool kt = false;
                ctpttckh = new Constants.ChiTietPhieuTTCuaKH();
                Sql = new Constants.Sql();
                string sql = Sql.DeleteChiTietPhieuTTCuaKH;
                Connection conn = new Connection();
                SqlConnection cn = conn.openConnection();
                SqlCommand cmd = new SqlCommand(sql, cn);

                cmd.Parameters.Add(ctpttckh.HanhDong, SqlDbType.VarChar, 20).Value = ctpttncc1.HanhDong;
                cmd.Parameters.Add(ctpttckh.MaHDBanHang, SqlDbType.VarChar, 20).Value = ctpttncc1.MaHDBanHang;
                cmd.Parameters.Add(ctpttckh.MaPhieuTTCuaKH, SqlDbType.VarChar, 20).Value = ctpttncc1.MaPhieuTTCuaKH;

                int i = cmd.ExecuteNonQuery();
                if (i == 1)
                    kt = true;
                else kt = false;
                cmd.Connection.Dispose();
                cn.Close();
                conn.closeConnection();
                cn = null;
                conn = null;
                return kt;
            }
            catch (Exception ex)
            {
                string s = ex.Message;
                return false;
            }
        }
        public Entities.ChiTietPhieuTTCuaKH[] Select()
        {
            Sql = new Constants.Sql();
            ctpttckh = new Constants.ChiTietPhieuTTCuaKH();
            string sql = "Select * from ChiTietPhieuTTCuaKH where Deleted = 0";
            Connection conn = new Connection();
            SqlConnection cn = conn.openConnection();
            SqlCommand cmd = new SqlCommand(sql, cn);
            SqlDataReader dr = cmd.ExecuteReader(CommandBehavior.CloseConnection);

            //Insert Category into ArrayList
            ArrayList arr = new ArrayList();
            while (dr.Read())
            {
                Entities.ChiTietPhieuTTCuaKH ctpttckh1 = new Entities.ChiTietPhieuTTCuaKH();
                ctpttckh1.MaHDBanHang = dr[ctpttckh.MaHDBanHang].ToString();
                ctpttckh1.MaPhieuTTCuaKH = dr[ctpttckh.MaPhieuTTCuaKH].ToString();
                ctpttckh1.TongTien = dr[ctpttckh.TongTien].ToString();
                ctpttckh1.TienNo = dr[ctpttckh.TienNo].ToString();
                ctpttckh1.ThanhToan = float.Parse(dr[ctpttckh.ThanhToan].ToString());
                ctpttckh1.TrangThai = (Boolean)dr[ctpttckh.TrangThai];
                ctpttckh1.GhiChu = dr[ctpttckh.GhiChu].ToString();
                ctpttckh1.Deleted = (Boolean)dr[ctpttckh.Deleted];
                arr.Add(ctpttckh1);
            }
            int n = arr.Count;
            if (n == 0) return null;

            Entities.ChiTietPhieuTTCuaKH[] arrC = new Entities.ChiTietPhieuTTCuaKH[n];
            for (int i = 0; i < n; i++)
            {
                arrC[i] = (Entities.ChiTietPhieuTTCuaKH)arr[i];
            }

            //Giai phong bo nho
            arr = null;
            cmd.Connection.Dispose();
            cn.Close();
            conn.closeConnection();
            cn = null;
            conn = null;
            return arrC;
        }