Mr. Ed
Get index of a selected item in a list view
I'm not sure, but I think you need to get the index from The ListView, not the Scrollviewer. If you were using a ListView > GridView, you'd get the index from the GridView.
Try reading this:
https://learn.microsoft.com/en-us/dotnet/api/system.windows.forms.listview.selecteditems?view=windowsdesktop-8.0
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