How to get The Union of Two Data tables without repetition?

[serheagolla]

If I have two datatables:\[quote\] dt1_temp , dt2_temp\[/quote\]The primary key is \[code\]Field<int>("person_id")\[/code\]Note: May be one of them null.How to get the Union in a third data table \[code\]dt\[/code\] without repetition.