Hi DR0607,

you can achive this using jQuery script

• Give some name to your Choice List ex. "ChkListUsers", By default it eill be Choice.
• use jQuery on change for all the controls with name like "ChkListUsers"
• add condition if checked items count is 1 then set not selected as disabled
• and if  checked items count is 0 then set not selected as enabled

for more information on this refer Restrict selection count in choice checkbox List By K2Guys

 let me know if it helps you.

thanks Karan,

It worked and I tried another way also using expression only

for that I took a datalabel which will store the last selected value of Checkbox list and as soon as user select 2nd value from checkbox I am eliminating the previous value from the new selection and assigning itr back to the checkbox list. :)

btw thats for showing another way also.

Thanks,

Divya Raj