void InitCreditorsCombo() { comboBox_creditors.AutoCompleteMode = AutoCompleteMode.SuggestAppend; comboBox_creditors.AutoCompleteSource = AutoCompleteSource.ListItems; List<Creditor> creditorList = LetterManager.GetCreditorList(); foreach (var item in creditorList) { comboBox_creditors.Items.Add(item.Alias.Trim()); } }