reCAPTCHA for .NET is a top .NET-based reCAPTCHA library which allows developers to easily integrate Google's reCAPTCHA service in ASP.NET web applications (Web Forms, MVC 5, ASP.NET Core). The following are highlights of the library are: * Renders reCAPTCHA widget and verifies reCAPTCHA response with minimal amount of code * Provides reCAPTCHA web control (ASP.NET Web Forms for .NET Framework 4.5 and above * Provides HTML helper to quickly render reCAPTCHA widget (ASP.NET MVC 5 / ASP.NET Core 3.1 and above) * Supprts reCAPTCHA version 2 * One of the most well-documented reCAPTCHA libraries in the open source community