public void UpdateTierListing() { uiTierTextBox.Text = null; List <Donor> donorList = SarreWindmillTrust.TierList(uiTierComboBox.Text); for (int i = 0; i < donorList.Count; i++) { uiTierTextBox.Text += String.Format("[{0}] {1}", donorList[i].ID, donorList[i].Name) + Environment.NewLine; } }