public IHttpActionResult Delete([FromUri]int id)
        {
            THANHTOANONLINE tt = (from s in db.THANHTOANONLINEs where s.MA == id select s).First();
            tt.DAXOA = true;
            db.SaveChanges();

            return Ok();
        }
        public IHttpActionResult Update([FromBody]THANHTOANONLINEModel news_tt)
        {
            Mapper.CreateMap<THANHTOANONLINEModel, THANHTOANONLINE>();
            THANHTOANONLINE _news_tt = Mapper.Map<THANHTOANONLINEModel, THANHTOANONLINE>(news_tt);
            THANHTOANONLINE tt = (from s in db.THANHTOANONLINEs where s.MA == _news_tt.MA select s).First();

            tt.MA = _news_tt.MA;
            tt.EMAIL = _news_tt.EMAIL;
            tt.MATHANHVIEN = tt.MATHANHVIEN;
            tt.DAXOA = _news_tt.DAXOA;

            db.SaveChanges();
            return Ok();
        }