public HttpResponseMessage Post(FormDataCollection form) { var values = form.Get("values"); var sinhVien = new SinhVien(); JsonConvert.PopulateObject(values, sinhVien); if (_sinhVienService.Add(sinhVien)) { return(Request.CreateResponse(HttpStatusCode.Created)); } return(Request.CreateErrorResponse(HttpStatusCode.BadRequest, "Mã sinh viên đã tồn tại")); }