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How to catch HttpRequestValidationException in production

I have this piece of code to handle the HttpRequestValidationException in my global.asax.cs file.

protected void Application_Error(object sender, EventArgs e){    var context = HttpContext.Current;    var exception = context.Server.GetLastError();    if (exception is HttpRequestValidationException)    {        Response.Clear();        Response.StatusCode = 200;        Response.Write(@"<html><head></head><body>hello</body></html>");        Response.End();        return;    }}

If I debug my webapplication, it works perfect. But when i put it on our production-server, the server ignores it and generate the "a potentially dangerous request.form value was detected from the client" - error page.I don't know what happens exactly...If anybody knows what the problem is, or what i do wrong..?

Also I don't want to set the validaterequest on false in the web.config.

The server uses IIS7.5, And I'm using asp.net 3.5.

Thanks,Bruno


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