public async Task GetPublicSymbols() { // Public symbols List <TTSymbol> publicSymbols; if (string.IsNullOrEmpty(PublicSymbolsFilter)) { publicSymbols = await _client.GetPublicAllSymbolsAsync(); } else { publicSymbols = await _client.GetPublicSymbolAsync(PublicSymbolsFilter); } PublicSymbols = publicSymbols != null ? new ObservableCollection <TTSymbol>(publicSymbols) : null; }