How do I add Text with the Listview Item?

I don't get it, how can I add a new Index with text.
I found ElementsForString but this overwrites the Element with Index 0.

Learn about using lists:

General Tutorials

You don't add directly to the ListView.

You go to the place where you keep the underlying data (DB, list, etc) and add the new item there, then
you retrieve it and load it all into the ListView.Elements

ABG Thank you I see I need the LIst Item