public async Task <Venue> GetVenueAsync(int venueId)
{
Venue venue = _venues.Values.FirstOrDefault(v => v.VenueId == venueId);
if (venue == null)
{
venue = await _venueRepository.GetVenueAsync(venueId);
if (venue != null)
{
_venues.Add(DateTime.Now, venue);
}
}
return(venue);
}