Ensure that you haven't enabled request validation for this page. I would keep validation running for your site - but turn it off on pages where you need this control.
Be sure to sanitize anything that gets posted and be prudent about security.
Ensure that you haven't enabled request validation for this page. I would keep validation running for your site - but turn it off on pages where you need this control.
Be sure to sanitize anything that gets posted and be prudent about security.
The short answer is you shouldn't be getting such an error if you turned off Request Validation.
Did you do one of these two things correctly?
Disable on the page by inserting this at the top of the ASPX
<%@ Page ValidateRequest="false" %>
Add the below section to your web.config.
<configuration>
<system.web>
<pages validateRequest="false" />
</system.web>
</configuration>
If that doesn't work then check the machine.config and see if the pages validaterequest value is set to true in there as that would override the web.config.