This event only fires when AllowAddNew property is set to true and the user creates a new empty row by moving the cursor into the last row on the grid.

It does not fire when a new row is added to the grid programmatically or through the grid's data source.

You can use this event to initialize the new rows.

When a new row is created this way, it is initially empty, and the user may cancel the row by moving the cursor out of the new row before making any edits. In this case, the grid fires the CancelAddRow event and the new (empty) row is removed.