CheckBox Column In DataGrid

Hi All,

I have a application in that i have a datagrid control.

I want a checkbox column to the datagrid so that user can select one or more rows to perform some action..

I want to ask you that which way is good to add check box column to the data grid..

1)Adding CheckBox Column to the RowHeader

or 

2)Adding DataGridCheckBoxColumn to the columns collections

Thanks & Regards

Vikas Gupta

Vikas Gupta