Hi,
Are you associating the contacts only with the appointments?

The contacts and other resources have to be present in the respective Calendar.Schedule collection (e.g. Calendar.Schedule.Contacts for contacts) in order to be properly associated with appointments.
The next example shows how to do that:

// Create two contacts and add them to the Schedule.
Contact c1 = new Contact();
c1.FirstName = "John";
c1.LastName = "Doe";
Calendar1.Schedule.Contacts.Add(c1);

Contact c2 = new Contact();
c2.FirstName = "Jill";
c2.LastName = "Doe";
Calendar1.Schedule.Contacts.Add(c2);

// Assign the second contact to a predefined appointment.
appointment.Contacts.Add(c2);
 

In my test after calling SaveToXml and then LoadFromXml for this schedule, the contacts list in the appointment's edit form displays two contacts, with the second being selected.

Let me know if this helps.

Lyubo

Hi,
I can't reproduce the problem with AutoPostBack set to true.

Could you try to reproduce the issue with the attached sample? It is the same sample that we sent you through the help desk, with a small alteration in the Page_Load handler to test the resources.

Just load the application and create a new appointment (there should be one location and two contact resources available to assign). After the postback, check if the appointment has retained the resources bindings.

Or if you prefer you can send us a sample that reproduces the problem at support@mindfusion.eu