public string FindZoneContainingUser(string userId)
{
var current = _currentLayerContracts.FirstOrDefault(c => c.UserId.Equals(userId) &&
!String.IsNullOrEmpty(c.CurrentZoneId));
if (current != null)
{
return(_zoneService.GetZoneContract(current.CurrentZoneId).ZoneID);
}
return(null);
}