I get the exception above when I try to submit a form in ASP.NET. This message was really useful, but even after installation, ValidateRequest="false"I get this error only for the "& #" combination. This particular combination is required since we use Norwegian characters.
ValidateRequest="false"
And I set httpRuntime requestValidationMode="2.0"in web.config.
httpRuntime requestValidationMode="2.0"
web.config
Well, from the comments, I do it as well as the answer.
Put ValidateRequest="false"in web.configto prevent the case when it hit a forgotten page without this declaration.
<pages validateRequest="false" ... >