"reCAPTCHA for .NET allows a developer to easily integrate Google's reCAPTCHA service (the most popular captcha control used by millions of sites) in an ASP.NET Web Forms or ASP.NET MVC web application.The primary features of the library are:* Renders recaptcha control with appropriate options.* Verifies user's answer to reCAPTCHA's challenge.* Supports ASP.NET 4.0, 4.5, and 4.5.1.* Supports ASP.NET MVC 4 and 5. * Seamless support for reCAPTCHA version 1 and version 2.reCAPTCHA for .NET has the best and most up-to-date documentation among all the other competing libraries."
RecaptchaNet
Library or NuGet package built with .net standard and c# by tanveery.
Project website: https://github.com/tanveery/recaptcha-net
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