private void _scheduleCheckTimer_Elapsed(object sender, ElapsedEventArgs e)
{
IEnumerable <ScheduleItem> validItems = _scheduleService.GetQualifiedItems(_data.Items).Cast <ScheduleItem>();
foreach (ScheduleItem item in validItems)
{
if (_CanExecute(item))
{
_synchronizationContext.Post((o) => _Execute(o as ScheduleItem), item);
}
}
}