20 March 2006
Free ASP.NET 2.0 CAPTCHA control
Posted by Mikhail Esteves under: C#; Tips .
At CodeProject:
CAPTCHA is short for “completely automated public Turing test to tell computers and humans apart” and is the most popular technique used to prevent computer programs from sending request to Web servers. This can be for meta-searching search engines, doing dictionary attacks in login pages or sending spam using mail servers. You may see CAPTCHA images in Google register page when you do availability check on too many usernames or in Yahoo, PayPal and many other big Web sites.
asp.net, c#, captcha, code 