The problem of GetUserAvailability function in exchange

Question

 GetUserAvailabilityResults freeBusyResults = service.GetUserAvailability(attendees,
                                                                                 new TimeWindow(DateTime.Now, DateTime.Now.AddDays(1)),
                                                                                     AvailabilityData.FreeBusy,myOptions);
            
            
            int i = 0;
            foreach (AttendeeAvailability availability in freeBusyResults.AttendeesAvailability)
            {
                Console.WriteLine("Availability information for:{0}", attendees[i].SmtpAddress);
              foreach (CalendarEvent calendarItem in availability.CalendarEvents)
                {
                    Console.WriteLine(calendarItem.Details.Subject.ToString());
                    Console.WriteLine("Free/busy status: " + calendarItem.FreeBusyStatus.ToString());
                    Console.WriteLine("Start time: " + calendarItem.StartTime.ToString());
                    Console.WriteLine("End time: " + calendarItem.EndTime.ToString());
                    Console.WriteLine();
                }
Why Console.WriteLine(calendarItem.Details.Subject.ToString()); always displays
"Object reference not set to an instance of an object." but others are correct？
Please help me.

Answer 1

Hello,

The current forum is for Outlook (i.e. client applications) specific questions. That's why I'd recommend asking Exchange Server related questions in the Exchange Server Development forum instead.