download each and every row in datagridview

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Windows

.NET

C#5.0

hello friends i am making one window base application
now i have struck somewhere thats why i need help from you experts.

i have a datagridview. i have already bound it from the database.
there are 5 columns and in one columns i have uploaded a image.

and in last i have created a download button from
DataGridViewButtonColumn download = new DataGridViewButtonColumn();
that download button is in each and every row of my datagridview.

now i want once i click on download button on each row . that row should be downloaded .

if possible give me some links to make me understand .
i will be very thankful all of you experts ....