protected void Login1_Authenticate(object sender, AuthenticateEventArgs e)
        {


            SqlConnection conn = new SqlConnection("Data Source=sqlserver01.webint.com.br;Initial Catalog=webint;Persist Security Info=True;User ID=webint;Password=igor1990");

            string sql = "select email, senha from tb_usuarios where email = @email and senha = @senha)";

            try
            {
                SqlCommand valor = new SqlCommand(sql, conn);
                valor.Parameters.Add(new SqlParameter("@senha", Login1.Password));
                valor.Parameters.Add(new SqlParameter("@email", Login1.UserName));

                conn.Open();
                valor.ExecuteNonQuery();
                conn.Close();
                RegisterClientScriptBlock("cadastrado", "<script>alert(Operação concluida !)</script>");
            }
            catch
            {
                RegisterClientScriptBlock("naoCadastrado", "<script>alert(Operação não concluida !)</script>");
            }
            finally
            {
                conn.Close();
            }
            /*
            if ((Login1.UserName == "admin")  && (Login1.Password == "123"))
            {
                e.Authenticated = true;
                FormsAuthentication.RedirectFromLoginPage(Login1.UserName, false);
                Response.Redirect("InserirRegistro.aspx");
            }
            else
            {
                e.Authenticated = false;
            }
             * */
        }