Try this:
Dim x as Integer
x = ListView1.FocusedItem.Index
Or else
Dim index As Integer = ListView1.SelectedIndices(0)
Or else
int index = 0;
if (this.myListView.SelectedItem.Count > 0)
index = this.myListView.SelectedIndices[0]
Or else
Use
ListView.SelectedIndex Property[
^]