Treeview demos:

These don't require a Web Server to be tested:
Frame-based layout
Frameless layout
Frameless layout with highlight
Thousands-of-nodes example
Using JavaSript functions with the tree
Small tree where each node is a checkbox or radio box for a form

This demo can only run if you call it through a web server (http:...) and if that web server can execute ASP code (i.e. IIS) and supports database connections:
Dynamic server-side script builds tree by reading a database of folders and links