How To Allow HTML to be Submitted in Your Forms
Ever gotten an error when you click submit when you enter some HTML in your form? Want users to be able to submit HTML tags? Not only is it possible, it’s easy! Somewhere in your page directive (i.e., where it says <%@ Page) on your .aspx page, simply include the attribute: validateRequest=”False”.
Yeah, that’s it.
EDIT: Be sure to check the comments by Eric on this post on how you can do this more securely! Also, for a more complete explanation, check his post on XSS Attacks.