DataGridview row color change

Hi All,

I have Datagrid which contains checkboxes for selecting data saving that data
 when i am saving data there is one condition if the selected one already present than highlight those rows
so before saving all rows are white but if some of them are already present than after click on save
those rows gets green and i also applied the onmouseover=yellow and onmouseout=white

so when i hover on the green rows color of those rows gets yellow but it should not be
it shold be green how to do this?

Thanks
Arpita