Fixing “A potentially dangerous Request.Form value” exception

I was merrily converting a site from .NET 2.0 to .NET 4.0 when…

Yes, I did say I was upgrading from 2.0 to 4.0.

Anyways, when I did this and used a page that allowed HTML elements to be entered in a TextBox, I got the oh-so helpful error “A potentially dangerous Request.Form value was detected…”

No problem, I would just add the ‘ValidateRequest=”false” ‘ tag at the top of the page and get back to business. But business was not happening, because I added the tag, and nothing happened. Luckily, a little browsing found the solution, which was editing the web.config file and adding the requestValidationMode:

<system.web>
    <httpRuntime requestValidationMode="2.0"/>
</system.web>

That did the trick.

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