You cannot use a WinForms Control directly in IE, you will have to instead derive from it and then use the derived instance from a custom assembly.

These articles introduce the topic:

Host Secure, Lightweight Client-Side Controls in Microsoft Internet Explorer by Jay Allen, MSDN Magazine, January 2002

Using Windows Forms Controls in Internet Explorer by Erick Ellis on www.windowsforms.net.

Contributed from George Shepherd's Windows Forms FAQ