private void LoadGrandItems() { GrandItemCheckedListBox.Items.Clear(); string rollSuject = SubjectComboBox.SelectedValue.ToString(); GrandItemCheckedListBox.DisplayMember = "name"; GrandItemCheckedListBox.ValueMember = "roll"; grandItems = ManagementController.GetGrandType(rollSuject); foreach (GrandItem item in grandItems) { GrandItemCheckedListBox.Items.Add(item); } }