You can set the listview.itemselectionchanged to change the text in a textbox. For a list that only allows a single selection:
Private Sub myListView_ItemSelectionChanged(sender As Object, e As ListViewItemSelectionChangedEventArgs) Handles myListView.ItemSelectionChanged
If myListView.SelectedItems.Count > 0 Then
MyTextBox.Text = myListView.SelectedItems(0).Text
End If
End Sub
If you need to allow multiple items to be selected from the list, you can step through the selectedItems collection and add them to the textbox.