Describes a data change event in a IDataModel.
Creates a new instance of DataEvent.
Indicates the kind of modification that has been performed.
< 0 : The rows have been removed from the model,
= 0 : The content of the rows has been updated,
> 0 : The rows have been added to the model.
If rows have been added to or removed from the model, and the range Rows will span all rows.
The IDataModel that is affected by this data event.