Inserting checkbox values into one field

hi


I have a checkboxes on my page (.aspx) like


checkbox1 - item1
checkbox2 - item2
checkbox3 - item3
etc


what i want is that when a user selects certain checkboxes
they should be inserted into a table called
customer which has fields (customer id and actions)


the data should be inserted as


customerid actions
1 item1,item2,item3
2 item1,item3
3 etc..


i.e all the values should be inserted into database into one field separated by commas.


Thanks