public ActionResult KetQuaTimKiem(FormCollection f, int?page) { string y = f["txtTimKiem"].ToString(); //tra ve 1 list co dinh tu khoa List <Sach> kqtk = db.Sach.Where(x => x.TenSach.Contains(y)).ToList(); List <ThongTinSach> thongtin = new SachDao().listSach(); var e = (from a in thongtin join b in kqtk on a.TenSach equals b.TenSach select a).ToList(); if (kqtk.Count == 0) { ViewBag.ThongBao = "Khong tim thay san pham nao"; return(View(thongtin.OrderBy(n => n.TenSach))); } return(View(e.OrderBy(n => n.TenSach))); }