| Data Access Modes > User Events Mode > True DataControl User Event Mode and True DBGrid Unbound Mode > Difference in Handling ApproximatePosition |
There is a slight difference in handling the ApproximatePosition argument of the UserReadData event. It has been optimized in True DataControl with respect to True DBGrid 8.0. If ApproximatePosition = -1 is passed to the event procedure, the programmer can skip setting the ApproximatePosition, which is optional anyway. Even if the programmer supplies a value, True DataControl will ignore it.
Also, the programmer can let True DataControl know that ApproximatePosition is unknown, setting it to -1 in the event procedure.
As in True DBGrid 8.0, the ApproximatePosition argument of the UserReadData event is used in conjunction with the ApproxCount property of the TData control.