An ASP.NET control that will render HTML

Is there an ASP.NET control which will render an HTML string to the page?  I want to be able to define a particular area on a form which will take a fully marked HTML and render it properly when the page is displayed.  Of course the form itself does this, but I want to define a particular area on the form.  Html elements won't work since they are not designed for html markup.  Anyone know of an ASP.NET control or a technique to accomplish this?

Thanks.