How to implement Custom Audio Capcha in ASP.Net

Question

We have created a Custom Capcha generator using C#.Net. Now we have requirement to upgrade our Capcha to include audio feature(Listen Capcha). Our major constraint is that w

Answer 1

RECAPTHA has this by default, so why would you want to re-invent the wheel?

http://blog.recaptcha.net/2008/12/new-audio-recaptcha.html