// danh sach pheiu thu
        public bool danhsachPhieuThu(List <phieuthutienDTO> listPTTDTO)
        {
            string query = string.Format("select* from [phieuthutienphat] ");

            SqlParameter[] parm = new SqlParameter[1];
            // khong can nhung phai co
            docgiaDTO dg = new docgiaDTO();

            parm[0]       = new SqlParameter("@mathe", SqlDbType.Int);
            parm[0].Value = dg.MaThe;

            DataTable datatable = new DataTable();

            datatable = conn.excuteNonQuery(query, parm);

            //gan value trong datatable vao DTO

            foreach (DataRow dr in datatable.Rows)
            {
                phieuthutienDTO pttDTO = new phieuthutienDTO();



                pttDTO.Ngaythu    = DateTime.Parse(dr["ngaythu"].ToString());
                pttDTO.Tienthu    = Int32.Parse(dr["tienthu"].ToString());
                pttDTO.Mathe      = Int32.Parse(dr["mathe"].ToString());
                pttDTO.Maphieuthu = Int32.Parse(dr["maphieuthu"].ToString());

                listPTTDTO.Add(pttDTO);
            }



            return(true);
        }
        // them phieu thu

        public bool themPhieuThu(phieuthutienDTO pttDTO)
        {
            string query = string.Format("insert into [phieuthutienphat] values (@maphieuthu,@ngaythu,@tienthu,@mathe)");

            SqlParameter[] param = new SqlParameter[4];
            param[0]       = new SqlParameter("@mathe", SqlDbType.Int);
            param[0].Value = Convert.ToString(pttDTO.Mathe);
            param[1]       = new SqlParameter("@tienthu", SqlDbType.Int);
            param[1].Value = Convert.ToString(pttDTO.Tienthu);
            param[2]       = new SqlParameter("@maphieuthu", SqlDbType.Int);
            param[2].Value = Convert.ToString(pttDTO.Maphieuthu);
            param[3]       = new SqlParameter("@ngaythu", SqlDbType.DateTime);
            param[3].Value = Convert.ToString(pttDTO.Ngaythu);

            conn.excuteNonQuery2(query, param);


            return(true);
        }