public IHttpActionResult KhachHangTraPhong([FromBody] dynamic dynamic) { string cmnd = dynamic.CMND.ToString(); using (NhanVienBusiness nhanVien = new NhanVienBusiness()) { string status = nhanVien.KhachHangTraPhong(cmnd); if (status.Equals("ok")) { return(Ok("Trả phòng thành công!")); } else { return(BadRequest(status)); } } }