function process_login()
    {
            $this->form_validation->set_rules('username', 'Username', 'required');
            $this->form_validation->set_rules('password', 'Password', 'required');

            if  ($this->form_validation->run() == TRUE)
            {
                $username = $this->input->post('username');
                $password = $this->input->post('password');

            if ($this->Login_model->check_user($username, $password) == TRUE)
            {
                    $data = array('username' => $username, 'login' => TRUE);
                    $this->session->set_userdata($data);
                    redirect('absen');
            }
            else
            {
                $this->session->set_flashdata('message', 'Maaf, username dan atau password Anda salah');
                redirect('login/index');
            }
        }
        else
        {
                $this->load->view('login/login_view');
        }