public static void FillComboboxWithNames(XDocument handle, ref ComboBox combo, string nameToSkip = "") { combo.Items.Clear(); List <string> names = XMLParser.GetAllEntityNames(handle); ComboBoxItem cBoxItem; foreach (string newEntity in names) { if (!newEntity.Equals(nameToSkip)) { cBoxItem = new ComboBoxItem(); cBoxItem.Content = newEntity; combo.Items.Add(cBoxItem); } } }