Rejects all changes made to the row since DataRow.AcceptChanges was last called.
When you call the DataRow.RejectChanges method, the DataRow.CancelEdit method is implicitly called to cancel any edits. If DataRow.RowState is deleted or modified, the row reverts to its previous values, and DataRow.RowState becomes unchanged. If the DataRow.RowState is added, the row is removed.