We are using C# exclusively for development with TList WinForms. The documentation is mostly tailored for VB, but it's straightforward to figure out most of the C# parallels. We needed to use the virtual control feature (i.e. where the control itself doesn't store a copy of the data) since we're shoving megabytes of data into it. At first, I had some trouble getting the virtual control stuff to work like I wanted, but an email to tech support got a quick response which exactly solved my problem. I must say that was a refreshing change from some other vendors! It's easy to get professional-looking trees and grids from this control, and it REALLY beats the Microsoft property grid hands down! I would recommend this product to any .NET developer wanting trees, grids, or some combination of the two. There are so many features and cool effects that I haven't seen anything else that compares to it.