I am looking for a good books or online material about this topic.
I am not talking about user control or server control that extend existing controls.
A completely new control with a visual content when it's placed on page in design view (like grid view)
i have a basic knowledge creating dll libraries in c# and now i want to learn more :)
UPDATE:
I've seen some ASP.NET controls created as "Class Library" and not "ASP.NET Server Control" project.
What is the difference?