hoe to get row index on templatefield click

Question

hii

i have a web form.. on that form i have a gridview..

in that gridview i have added data from database and one link button which display info about "folder no- photo no".. that is calculated dynamically..

"folder no- photo no" is a link ... Now i want value of 1st row on that linkbutton click..

is it possible? how?