private void simpleButton2_Click(object sender, EventArgs e)
        {
            var service = new IadmClient( );
            var periode = service.viewPeriode( ).FirstOrDefault(x => service.ServerTime() >= x.awalSemester &&
                                                                service.ServerTime() <= x.akhirSemester);
            var data = new jadwalPraktikan( )
            {
                nrp            = nrppraktikan,
                id_jadwal_umum = new jadwal_umum( )
                {
                    id_periode = periode.id_periode
                }
            };

            try
            {
                service.DeleteJadwalPraktikan(data);
            }
            catch (Exception)
            {
                XtraMessageBox.Show("Error");
            }
            Close( );
        }