Data providers may ignore this value on incoming requests to add a new Recurrence to the data source. If the data provider (or data source) is responsible for creating a unique key identifying this WebSchedule object, then the data provider must set this DataKey property on the DataContext to return it's value to the consumer.
Target Platforms: Windows 10, Windows 8.1, Windows 8, Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2