private void TambahJadwalAsisten_Load(object sender, EventArgs e) { var service = new IadmClient(); var asisten = service.getStaffID().ToList(); var praktikum = service.GetMatKul().ToList(); for (var i = 0; i < asisten.Count(); i++) { comboBoxEdit1.Properties.Items.Add(asisten[i].id_staff); } for (var i = 0; i < praktikum.Count(); i++) { comboBoxEdit4.Properties.Items.Add(praktikum[i].mata_kuliah); } }