multiple selection of items in checklist Box and show respective value in textbox

[GAURAV MANUSMAR]

I have one CheckListBox and one TextBox....item s of checkListBox is bound to the

"user_name" column of the table in database and there is one more column "email_id"..... ..my

question is that when i check multiple items form the checklist box it will show the their

respected value(email_id) into the TextBox separating with "," (comma operator)