void InsertAppointment()
{
ValidationSchedule schedule = SchedulerDataHelper.GetAppointmentToInsert <ValidationSchedule>(
SchedulerDataHelper.CustomDataObject, SchedulerDemoHelper.CustomAppointmentStorage);
if (schedule != null && TryValidateModel(schedule))
{
CarsDataProvider.InsertSchedule <ValidationSchedule>(schedule);
}
else
{
ViewData["EditableSchedule"] = schedule;
}
}