ListBox - finding specific data and index

[JeezyWonder]

I think if it were me I would make use of the item data portion of the list box and place my id there.
Would be quicker and easier to loop through the list and check the item data value rather than parsing the string for the ID
This would give you the index of the item if it exists and allow you to update the text of the item in the list as needed.

Thanks for your attention, btw can you provide simple exmaple for better understanding?