title: Protect against a DoS attack without a CAPTCHA
body: <p>I'd love to know a good way to protect against DoS attacks on my email and contact forms.</p>
  
  <p>I have a "Share with a Friend" function which opens up a form I've created, but I'd rather not put in a CAPTCHA. </p>
  
  <p>I've seen a jQuery + PHP solution here: 
  <a href="http://docs.jquery.com/Tutorials:Safer_Contact_Forms_Without_CAPTCHAs#PHP_File" rel="nofollow">http://docs.jquery.com/Tutorials:Safer_Contact_Forms_Without_CAPTCHAs#PHP_File</a></p>
  
  <p>It looks like a good solution, I'd just like some help translating the PHP into C#. I'm guessing an ASHX file would be best to use. </p>
  
  <p>If there are also other (better?) solutions I'd love to hear them.</p>