public Period GetPeriod(int periodId)
{
if (Periods.Any(c => c.PeriodId == periodId))
{
return(Periods.First(c => c.PeriodId == periodId));
}
return(null);
}
protected string ExpandedPeriodTitles()
{
if (Periods == null || !Periods.Any())
{
throw new ArgumentNullException("Properties");
}
return(String.Join(", ", Periods.Select(p => p.WrappedTitle)));
}