A potentially dangerous Request.Form value was detected from the client

by

Use

<httpRuntime requestValidationMode="2.0" />

in your web.config (keeping any attributes you already have on that element, if it’s already there). ASP.NET4.0 ignores ValidateRequest otherwise.

And, of course, do make sure that you take necessary measures to protect against genuinely dangerous requests, now that it’s not being done for you.

Edit: A great way of doing this is to create your own class derived from RequestValidator, and using the 4.0 behaviour, but with that as the class that does the checking.

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