Using exchange web services to get the required attendees of a calendaritem? c#

I am trying to get the required attendees of a meeting which I got using the exchange web service. Any ideas? I think I need to use CalendarItemType, but I'm not sure how to implement it. Here is my code so far:

        foreach (var wrk in Workers)
        {
            TimeWindow timeWindow = new TimeWindow(startDate, endDate);
            AvailabilityData requestedData = AvailabilityData.FreeBusy;
            List<AttendeeInfo> attendees = new List<AttendeeInfo>();
            attendees.Add(new AttendeeInfo(wrk.EmailAddress));
            GetUserAvailabilityResults ares = service.GetUserAvailability(attendees, timeWindow, requestedData);
            foreach (AttendeeAvailability av in ares.AttendeesAvailability)
            {
                foreach (CalendarEvent ev in av.CalendarEvents)
                {
                    //get info from each calendarevent
                    //Possibly use CalendarItemType here?
                 }
             }
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Where Workers is a class I made with a list of names and corresponding email addresses.

You can retrieve the required attendees by binding to the appointment using Appointment.Bind:

foreach (CalendarEvent ev in av.CalendarEvents)
{
    var appointment = Appointment.Bind(service, new ItemId(ev.Details.StoreId));
    foreach (var requiredAttendee in appointment.RequiredAttendees)
    {
        Console.WriteLine(requiredAttendee.Address);
    }
}

You may have to convert CalendarEvent.Details.StoreId to a different format before calling Appointment.Bind (I am not sure about this), so if the above code is not working you may try adding a call to ExchangeService.ConvertId:

foreach (CalendarEvent ev in av.CalendarEvents)
{
    var convertedId = (AlternateId) service.ConvertId(new AlternateId(IdFormat.HexEntryId, ev.Details.StoreId, "someemail@domain.com"), IdFormat.EwsId);

    var appointment = Appointment.Bind(service, new ItemId(convertedId.UniqueId));
    foreach (var requiredAttendee in appointment.RequiredAttendees)
    {
        Console.WriteLine(requiredAttendee.Address);
    }
}