How do I add CheckedBox Columns to DataGrid Control at Runtime?

Hi I want to add checkedbox, label columns to datagrid at runtime.





I already have a dataset, with filled data.





Like this





====================================


CAR New OLD


====================================


Car1 [ ] [ ]


Car2 [ ] [ ]


Car3 [ ] [ ]


------------------------------------





After adding how to I access these columns?How do I add CheckedBox Columns to DataGrid Control at Runtime?
use HTML control array





Access control by name of html element. oldcar[x]