protected void btDangNhap_Click(object sender, EventArgs e) { class_TracNghiem ob = new class_TracNghiem(); if (ob.login_check(tbPass.Text)) if (lbID.Text != "") { HttpCookie obCookie = new HttpCookie("EXAMS"); obCookie.Value = lbID.Text; obCookie.Expires = DateTime.Today.AddDays(1); Response.Cookies.Add(obCookie); Response.Redirect("User_Exam.aspx"); } else { } else lbTrangThai.Text = "Mật khẩu không đúng"; }