Handling an 'A potentially dangerous Request.Form value was detected' exception without deactivating validation

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Norman Reedus · Answer

I don't know 100% if this would work, but I do something similar for other situations, so I think it will. But try adding an Application_error handler in the global.asax, and look for that exception type, if Server.GetLastError() returns that exception type, try redirecting to your error page. I don't know what the exception type is, but that is easy to find (or just check the message).

Something like:

void Application_Error(..)
{
   var ex =Server.GetLastError();
   if (ex != null && ex is <whateverexceptiontype>) { // or check ex.Message matches
    
HttpContext.Current.Response.Redirect("niceerrorpage.aspx")
   }
}

Anonymous User · Answer

to allow the html character you need to

change the attribute value of page directive <%@ Page ValidateRequest="false" you can apply this as global level via web.config file inside <system.web> section

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Handling an 'A potentially dangerous Request.Form value was detected' exception without deactivating validation

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