public async Task GetTicksLevel2()
{
// Account feed ticks level2
List <TTFeedTickLevel2> ticksLevel2;
if (string.IsNullOrEmpty(TicksL2Filter))
{
ticksLevel2 = await _client.GetAllTicksLevel2Async();
}
else
{
ticksLevel2 = await _client.GetTickLevel2Async(TicksL2Filter);
}
TicksL2 = ticksLevel2 != null ? new ObservableCollection <FeedTickL2View>(ticksLevel2.Select(t => new FeedTickL2View(t))) : null;
}