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 more about a few commonly used components and explore their utility and usages.
Master using the EF core with a version available that is specifically designed for use with the .NET Core.
Studying this article will help you fully understand Visual Basic and .NET data types.