How can I edit items in a listbox?

What I need to do is: when the user clicks the 'edit' button, it should reference the listbox to ensure an item was selected. So, if an item is selected, I need to store the item to a string variable. Next, the user should be able to use a textbox
with a button to confirm the change, and a button to cancel the change.
Thanks.

OK, have you tried to do any of what you describe? If so, you can post your code here and describe what part(s) are not working for you.
If you have not started yet, I suggest you read up on the ListBox class iterms collection and the methods available to manage that collection. Here are a couple of useful references:
https://msdn.microsoft.com/en-us/library/system.windows.forms.listbox.objectcollection%28v=vs.110%29.aspx?f=255&MSPPError=-2147217396
https://msdn.microsoft.com/en-us/library/system.windows.forms.listbox.items(v=vs.110).aspx
If you're stuck, this simple example project I threw together may help you:
https://onedrive.live.com/redir?resid=2E6335432DF7904B%2119080

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How can I edit items in a listbox?

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