Addrange not working to add an entry in Listview

What must I used to add an entry to a listview in a Web appl from my VB behind code?
The below code work in an Windows pgm but not in a Web appl.  What code must I used.
ListView_Listview1.items.addrange(new listviewitem() {LVI})  Get message ADDRANCE is not a member of system.collection.general.ilist