Using Google reCAPTCHA in ASP.NET MVC - reCAPTCHA Generator

GoogleCaptchaHelper.cs

public static class GoogleCaptchaHelper
{
    public static IHtmlString GoogleCaptcha(this HtmlHelper helper)
    {
        const string publicSiteKey = SiteSettings.GoogleRecaptchaSiteKey;

        var mvcHtmlString = new TagBuilder("div")
        {
            Attributes =
            {
                new KeyValuePair<string, string>("class", "g-recaptcha"),
                new KeyValuePair<string, string>("data-sitekey", publicSiteKey)
            }
        };

        const string googleCaptchaScript = "<script src='https://www.google.com/recaptcha/api.js'></script>";
        var renderedCaptcha = mvcHtmlString.ToString(TagRenderMode.Normal);

        return MvcHtmlString.Create($"{googleCaptchaScript}{renderedCaptcha}");
    }
}