Hi Reader !
From this blog we can learn how to add google captcha in your web site using c# .
To use a Google Captcha(or reCaptcha) in your web application, you first have to follow below steps :
1) Open url https://www.google.com/recaptcha/intro/index.html and sign up using your google account
2) Click on Get reCAPTCHA button to get your reCaptcha public and private keys for your site.
3) Download the Google Captcha (reCAPTCHA) ASP.NET library (i.e. Recpatcha.dll) via
Now to insert captcha control in your web application, add below line at the top of your aspx page :