In order to achieve this, you should access the DayViewAllDayHeader which represents the area in the SchedulerDayViewElement where all-day appointments are shown:
SchedulerDayViewElement schedulerDayViewElement = this.radScheduler1.SchedulerElement.ViewElement as SchedulerDayViewElement;
if (schedulerDayViewElement != null)
DayViewAllDayHeader allDayHeader = schedulerDayViewElement.AllDayHeaderElement;
allDayHeader.Visibility = ElementVisibility.Collapsed;
I hope this helps. Should you have any other questions do not hesitate to ask.
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