public void ValidateTimeRange(DateTime startTime, TimeSpan duration)
{
_playItems.ValidateTimeRange(startTime, duration);
//var e = new TimeValidationEventArgs(startTime);
//OnValidateStartTime(e);
//if (!e.IsValid)
//{
// throw new InvalidTimeException(startTime);
//}
//ValidateTimeRange(startTime, startTime.Add(duration));
}
