This is a TreeListView, running in virtual mode. the data is never stored within the control.
Latest Tree View Articles
Thanks to ASP.NET 2.0's built-in TreeView control, you can give your Web site a professional-looking navigation system that displays hierarchical data—without having to write lots of code and script.
Learn to get around the limitation for the maximum value of the .NET TreeView's ItemHeight property.
Latest CodeGuru Developer Columns
Learn to implement exception handling mechanism in C++.
With the arrival of C# 7, tuples have changed quite a bit. If you haven't been using them, read this article; you might reconsider their use.
Become introduced to the fantastic world of .NET Core.
Take advantage of pattern matching to check for patterns in your code, improve performance, and simplify your code.