public ActionResult EditKhachhang(KHACHHANG khachhang) { if (Session["Show2"] == null) { return(RedirectToAction("Index", "NhaThuoc")); } try { if (ModelState.IsValid) { database_access_layer.db db = new database_access_layer.db(); db.Suakhachhang(khachhang); return(RedirectToAction("KhachhangDetails", "NhaThuoc", new { id = Session["Show2"] })); } } catch (Exception ex) { @ViewBag.Error = ex.Message; return(View(khachhang)); } return(View(khachhang)); }