Howdy guys, for those interested in an Open Source Ajax Tree View widget for ASP.NET, feel free to check out this.
The example code, illustrates how to browse your folders in your web site, in 16 lines of code. The tree view widget also allows for search engines indexing its nodes, and you bookmarking items, even though it's 100% "single page app".
PS!
The code is "Hyperlambda", which is a way to configure your page. But underneath the hoods, it's all C# and ASP.NET.
Feel free to supply feedback here ... :)