private void AddPeriode(object sender, EventArgs e) { DateTime mulai = dateEdit1.DateTime; DateTime selesai = dateEdit2.DateTime; string a = comboBoxEdit1.SelectedItem.ToString(); IadmClient service = new IadmClient(); periode data = new periode() { semester = a, awalSemester = mulai, akhirSemester = selesai }; service.addPeriode(data); gridControl1.DataSource = service.viewPeriode().Select(x => new { semester = $"{x.semester} {x.awalSemester.ToString("yyyy")}/{x.akhirSemester.ToString("yyyy")}", awalSemester = x.awalSemester.ToString("dd MMMM yyyy", new CultureInfo("id-ID")), akhirSemester = x.akhirSemester.ToString("dd MMMM yyyy", new CultureInfo("id-ID")) }).ToList(); service.Close(); }