Hi Arindam. Thanks very much for your reply. I tried your suggestion w/o success. I did so even I saw (by stepping through with the debugger) the errant behavior occur on and between the two distinct "steps": 1. aTeamNameRBL.SelectedIndex = aTeamSelected 2. hTeamNameRBL.SelectedIndex = hTeamSelected If it would be of use to anyone I have screen captures showing the fact that after step 1. is executed, the SelectedIndex of both RadioButtonList's are set to the "aTeamSelected" value, and then after step 2. both are set to the "hTeamSelected" value. Also, I'd be happy to grab whatever additional debug detail you might suggest. As I've seen Visueal Studio occasionally wrap itself around the axle and not register the fact changes have been made I also tried... a. Deleting and recreating the RBLs b. Deleting the RBs, saving the file, closing the project and then recreating them c. Renaming them None of these attemps made any difference. As soon as the first RBL was adjusted, the second was as well, and vice-versa. HELP!!!!