Structure of my asp: repeater

repeater
    updatePanel
         label1 (rating)
         button (updates rating)
         some_picture (thing being rated)
     /update panel
/repeater

Imagine the output of the above repeater containing 100 rows. (1 label, and 1 button on each row).

Goal: when I click the button, I want the appropriate label to be updated. I dont know how to do this. I can reference a label via:

Label myLabel2Update = (Label)Repeater1.Controls[0].Controls[0].FindControl("Label1");

But ofcourse, it will be the same label each time (not necessarily the label that needs to be updated). I need to update the label that is on the same row as the button.

Any guidance would be appreciated.