Hello Pierre,
Do you use binding expressions for the controls (and ID field in particular) inside the ItemTemplate/SelectedItemTemplate of RadListView as illustrated on
this online demo of the product? Thus you should be able to fetch the data as expected.
You may also provide the entire markup and code-behind implementation related to RadListView in this thread - thus I will be able to familiarize with your complete code logic and advice you further.
Best regards,
Sebastian
the Telerik team