ASP.NET is a new technology. It’s million years ahead than asp.HTML controls are duplicates of old HTML controls. In case you want to convert your design to asp.net, you just have to add "runat" attribute to it
and change the page to aspx.

While Web Controls are a revolution. You can place all the HTML controls as you were insertion in Dreamweaver. The pages show that Web Controls are placed, but in fact the controls are generated only on server.

All html controls are been changed with web controls and a lot of are added.