What is CAPTCHA? ————————————————————————————————————————————— CAPTCHA (Completely Automated Public Turing test to tell Computers and Humans Apart) is a distorted image of letters and numbers, used to prevent automated use of Websites from machines (generally called as bots). It adds security to your site. No bots can read distorted images as well as humans can do, […]

If you want to know what is reCAPTCHA and how to use it in your ASP.NET Web application then please refer to the Tip “How to use reCAPTCHA in your site?” In the above Tip i am validating the captcha on postback. But this tip will show you how to validate the captcha by AJAX […]