Hi,

I use EWS library.
I have to create new appointment and send invitations to some attendees.
Than I need add or delete an attendee and send invitation to only changed attendee.

I found an article on MSDN and tried to do it in test project:

    public partial class Form1 : Form
    {
        private const string OFFICE_365 = "Office365_email@aa.com";
        private const string GMAIL_1 = "Gmail1@gmail.com";
        private const string GMAIL_2 = "Gmail2@gmail.com";

        private ExchangeService _exchangeService;
        private ItemId _itemId;

        public ExchangeService ExchangeService
        {
            get
            {
                if (_exchangeService == null)
                {
                    _exchangeService = new ExchangeService(ExchangeVersion.Exchange2013_SP1)
                    {
                        Credentials = new WebCredentials("sender@aa.com", "pass"),
                        Url = new Uri(@"https://outlook.office365.com/EWS/Exchange.asmx")
                    };
                }
                return _exchangeService;
            }
        }

        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            Appointment appointment = new Appointment(ExchangeService);
            appointment.Start = DateTime.Now.AddDays(2);
            appointment.End = appointment.Start.AddHours(2);
            appointment.Subject = DateTime.Now.Ticks.ToString();
            appointment.RequiredAttendees.Add(OFFICE_365);
            appointment.RequiredAttendees.Add(GMAIL_1);
            appointment.RequiredAttendees.Add(GMAIL_2);

            appointment.Save(SendInvitationsMode.SendToAllAndSaveCopy);

            _itemId = appointment.Id;

            MessageBox.Show("Done");
        }

        private void button2_Click(object sender, EventArgs e)
        {
            Appointment appointment = Appointment.Bind(ExchangeService, _itemId);

            appointment.RequiredAttendees.RemoveAt(0);

            appointment.Update(ConflictResolutionMode.AlwaysOverwrite, SendInvitationsOrCancellationsMode.SendOnlyToChanged);
            MessageBox.Show("Done");
        }
    }

It doesn't work properly!!  - When I update appointment (button2_Click) I receive invitation for all attendees! :(

I looked for the same provblem and found an article on StackOverflow.
I tried to do it but it still doesn't work.

I use EWS 2.2 the last version: 15.0.913.15

How can I fix it?
Any ideas?

Thanks.

• Edited by Igor Leshin Thursday, May 21, 2015 3:05 PM

Hi,

Any ideas? :(