Hi folks
I am writing the following code to add or remove the items from one listbox to another. But my problem is suppose one user adds item A from listbox1 to listbox2 and again select item A and click on button then it again appears in listbox 2 so if the user does it for 10 times then 10 times same item A appears in Listbox2 which is not right so one item should be present once only in other listbox and multiple copy should not be allowed.
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