It is not possible to implement the Google reCAPTCHA in ASP.NET MVC directly as it requires JavaScript codes to be added to the HTML page. However, there are libraries and plugins available that can be used to easily integrate the Google reCAPTCHA in an ASP.NET MVC application.

 

One such library is the Google reCAPTCHA .NET library, which provides a wrapper for the reCAPTCHA API and can be easily used in an ASP.NET MVC project.

1 Register for a reCAPTCHA API
2. In the HTML page where you want to add the reCAPTCHA, add the necessary script tags to load the reCAPTCHA API and specify the site key obtained from the previous step.
3. In the ASP.NET MVC controller action where the form is submitted, add a parameter for the reCAPTCHA response token.
4. In the controller action, use the Google reCAPTCHA .

If the token is valid, continue with the form submission process, otherwise, return an error. Lastly, you can customize the reCAPTCHA appearance and behavior using the options available in the library.