public void Save() { Properties.Settings.Default.InputColumnsToInclude = string .Join(Separator.ToString(), InputColumnsToInclude.ToArray()); Properties.Settings.Default.ColumnsToAdd = string .Join(Separator.ToString(), ColumnsToAdd.ToArray()); Properties.Settings.Default.OutputDateTimeFormat = OutputDateTimeFormat; Properties.Settings.Default.MerchantCurrency = MerchantCurrency; Properties.Settings.Default.NameWithSingleMonth = NameWithSingleMonth; Properties.Settings.Default.SettingAlreadySaved = true; Properties.Settings.Default.Save(); }