You should be able to do something like this:
FindItemsResults<Appointment> tApts = service.FindAppointments(CalendarFolderID, cv);
List<Appointment> apts = tApts.Items.ToList<Appointment>();
The Items property is a Collection<T>
which you can do a .ToList()
with the extension methods as long as you have using System.Linq;
defined in your cs file.
Hope this helps.