static void UpdateAppointment()
{
List <CustomAppointment> appointmnets = System.Web.HttpContext.Current.Session["AppointmentsList"] as List <CustomAppointment>;
List <CustomResource> resources = System.Web.HttpContext.Current.Session["ResourcesList"] as List <CustomResource>;
CustomAppointment[] insertedAppts = SchedulerExtension.GetAppointmentsToInsert <CustomAppointment>(SchedulerDataHelper.GetSchedulerSettings(), appointmnets, resources);
SchedulerDataHelper.InsertAppointments(insertedAppts);
CustomAppointment[] updatedAppts = SchedulerExtension.GetAppointmentsToUpdate <CustomAppointment>(SchedulerDataHelper.GetSchedulerSettings(), appointmnets, resources);
SchedulerDataHelper.UpdateAppointments(updatedAppts);
CustomAppointment[] removedAppts = SchedulerExtension.GetAppointmentsToRemove <CustomAppointment>(SchedulerDataHelper.GetSchedulerSettings(), appointmnets, resources);
SchedulerDataHelper.RemoveAppointments(removedAppts);
}