Gets the normalized appointment start value which is recommended for use in interval-based appointment data source queries.
A DateTime value that is the start of the appointment.
The QueryStart and SchedulerItemBase.QueryEnd properties allow you to calculate the correct interval for use in a SELECT query for SchedulerControl.VisibleIntervalsChanged, DataSource.FetchAppointments, and DataSource.FetchTimeRegions event handlers. The use of the SchedulerItemBase.Start and SchedulerItemBase.End properties is not recommended in this scenario, because their values do not take recurrences into consideration.
The QueryStart property return values are dependent on the appointment type, as shown in the following table.
|Appointment Type||QueryStart Value|
|AppointmentType.Normal||The SchedulerItemBase.Start value.|
|AppointmentType.Pattern||The Start value of the earliest Occurrence, ChangedOccurrence or DeletedOccurrence.|
|AppointmentType.ChangedOccurrence||The QueryStart value of the pattern.|
|AppointmentType.DeletedOccurrence||The QueryStart value of the pattern.|