Since you didn't frame your question well you did not receive any useful information. First you failed by posting a non functional link and the you failed by thinking you could just post another question. From the link in your repost you could have easily seen that what you are looking for is a treeview. That word is in the URL.
Anyhow here is the MSDN information for the ASP.NET TreeView control
Here is a tutorial: http://www.brainbell.com/tutorials/ASP/TreeView.html
See here on CP: A simple Binary Search Tree written in C#[^].
or here: http://www.dijksterhuis.org/implementing-a-generic-binary-tree-in-c/[^]
and not to forget here: http://www.smokycogs.com/blog/an-implementation-of-a-binary-tree-in-c-sharp/[^].
Let's see what the Microsofties have: http://msdn.microsoft.com/en-us/library/ms379573(v=vs.80).aspx[^].
That should just about do it. Any doubts left?