public async Task GetSymbols()
{
// Account symbols
List <TTSymbol> symbols;
if (string.IsNullOrEmpty(SymbolsFilter))
{
symbols = await _client.GetAllSymbolsAsync();
}
else
{
symbols = await _client.GetSymbolAsync(SymbolsFilter);
}
Symbols = symbols != null ? new ObservableCollection <TTSymbol>(symbols) : null;
}