Problem with page loading when radio button clicked

Hi I have a web page with radio buttons and repeaters. When a radio button is clicked other textboxes get enabled/disabled. The radios have autopostback=true. When the submit button is clicked then the repeaters get populated. However, since I added sorting to the repeaters and needed to add on if page.ispostback the bind function each time a radio button is clicked the repeaters get loaded. How can I fix this? Thanks