Based on the new API version (v2) of the Google Recaptcha this is a Web Forms .NET implementation of the API as a validation control.
- Go to the recaptcha admin and register your site for an API Key and Secret.
- Compile or get the DLL from the latest release
- Add reference to your project, or add it to the /bin directory, and
<add assembly="recaptchav2" namespace="recaptchav2" tagPrefix="re"/>
to your web.config. - Add the control to your page
- Validation group support
- Ajax/UpdatePanel support
- 2015-04-25 - v1.0 First release, single validation summary support.