HOW to..

hi,
ive a gridview that shows all the buttons that i wanted user to click on it to calculate something.

in my gridview, i have the button merit/demerit button and i would like to set access rights to it. for eg: for this merit/demerit button, i only want the login name : LS to access this button. if not, message pop up says that this person has no access rights for this button.

how do i go abt doing it ?

i want to know the codes on how to set the button for user access rights. thank you!