Is it Possible to Append items with existing items in Checkboxlist?

Hello Everybody,


I have 4 Checkboxlists, if i check 1st item of checkboxlist1 -- > populate items in checkboxlist2
if i check 2nd item in checkboxlist1 -- > populate items in checkboxlist2 with last selection as well as 1st checkboxlist items.
So I need to Append items in Checkboxlist with existing items and also with previously selected Checkox.
Is it any way except DataTable ????


Please Help if anybody knows.


Regards,
Sheetal

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