Locks the object until the EndUpdate or CancelUpdate method is called.
Call the BeginUpdate method to maintain performance while applying multiple modifications to the object. After the BeginUpdate method the IsUpdateLocked property returns false to prevent other processes from modifying the object or retrieving its properties. After applying all modifications, call the EndUpdate or CancelUpdate method to finalize the update or cancel it.
Each call to BeginUpdate must be paired with a call to EndUpdate or CancelUpdate. To ensure that EndUpdate/CancelUpdate is always called even if an exception occurs, enclose them in the try...finally statement.