protected void CustomChallengeResponse(object sender, NoBotEventArgs e)
{
// This is a sample challenge/response implementation that involves
// the DOM so as to make the calculation more difficult to thwart.
// It adds a randomly sized Panel; the client must calculate the area.
Panel p = new Panel();
p.ID = "NoBotSamplePanel";
Random rand = new Random();
p.Width = rand.Next(300);
p.Height = rand.Next(200);
p.Style.Add(HtmlTextWriterStyle.Visibility, "hidden");
p.Style.Add(HtmlTextWriterStyle.Position, "absolute");
((NoBot)sender).Controls.Add(p);
e.ChallengeScript = string.Format("var e = document.getElementById('{0}'); e.offsetWidth * e.offsetHeight;", p.ClientID);
e.RequiredResponse = (p.Width.Value * p.Height.Value).ToString();
}
protected void NoBot2_GenerateChallengeAndResponse(object sender, NoBotEventArgs e)
{
// A simple challenge
e.ChallengeScript = "'cHaLlEnGe'.toUpperCase()";
e.RequiredResponse = "CHALLENGE";
}
