public ActionResult Calendar()
{
IEnumerable <Appointment> appointments = appointmentBusiness.List();
List <CalendarModel> calendarItems = new List <CalendarModel>();
appointments.ToList().ForEach(item =>
{
calendarItems.Add(AppointmentModel.ToCalendarModel(item));
});
ViewBag.Appointments = ToJSON(calendarItems);
return(View());
}