How To Prevent Duplicate Item

Jul 26, 2010

i have a dropdownlist (asp.net control) and a listbox control and a Add button when the user select the item from dropdownlist and click on add button to add to the listbox.

how can i prevent the user from adding duplciate items and alert saying its already in the listbox?

UPDATE:

in my particular scenario, i have a dropdwonlist and adding the item to listbox both are asp.net controls and i am adding the items from code-behind and your solution is pure on client side, is there a way i can read the listbox and compare and alert the message?

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