/// <summary>
        /// Renders the recaptcha HTML in an MVC view. It is an extension method to the <see cref="System.Web.Mvc.HtmlHelper"/> class.
        /// </summary>
        /// <param name="htmlHelper">The <see cref="System.Web.Mvc.HtmlHelper"/> object to which the extension is added.</param>
        /// <param name="publicKey">Sets the public key of recaptcha.</param>
        /// <param name="theme">Sets the theme of recaptcha.</param>
        /// <param name="language">Sets the language of recaptcha. If no language is specified, the language of the current UI culture will be used.</param>
        /// <param name="tabIndex">Sets the tab index of recaptcha.</param>
        /// <param name="dataType">Sets the data type of recaptcha.</param>
        /// <param name="dataSize">Sets the size of recaptcha.</param>
        /// <param name="useSsl">Sets the value to the UseSsl property.</param>
        /// <param name="apiVersion">Determines the version of the reCAPTCHA API.</param>
        /// <returns>Returns an instance of the IHtmlString type.</returns>
        public static IHtmlString Recaptcha(
            this HtmlHelper htmlHelper,
            string publicKey = "{recaptchaPublicKey}",
            RecaptchaTheme theme = RecaptchaTheme.Red,
            string language = null,
            int tabIndex = 0,
            RecaptchaDataType? dataType = null,
            RecaptchaDataSize? dataSize = null,
            SslBehavior useSsl = SslBehavior.SameAsRequestUrl,
            string apiVersion = "{recaptchaApiVersion}")
        {
            IRecaptchaHtmlHelper rHtmlHelper = null;

            string version = RecaptchaKeyHelper.ParseKey(apiVersion);

            if (version != "2")
            {
                rHtmlHelper = new RecaptchaHtmlHelper(publicKey, theme, language, tabIndex, useSsl);
            }
            else
            {
                rHtmlHelper = new Recaptcha2HtmlHelper(publicKey, theme, language, tabIndex, dataType, dataSize, useSsl);
            }

            var writer = new HtmlTextWriter(new StringWriter());
            writer.Write(rHtmlHelper.ToString());

            return htmlHelper.Raw(writer.InnerWriter.ToString());
        }
        public void PublicKeyIsPassedCorrectly()
        {
            var key    = "TestKey";
            var target = new RecaptchaHtmlHelper(key);

            Assert.AreEqual(key, target.PublicKey);
        }
        public void LanguageIsPassedCorrectly()
        {
            var language = "en";
            var target   = new RecaptchaHtmlHelper("TestKey", RecaptchaTheme.Red, language, 0);

            Assert.AreEqual(language, target.Language);
        }
        /// <summary>
        /// Renders the recaptcha HTML in an MVC view. It is an extension method to the <see cref="System.Web.Mvc.HtmlHelper"/> class.
        /// </summary>
        /// <param name="htmlHelper">The <see cref="System.Web.Mvc.HtmlHelper"/> object to which the extension is added.</param>
        /// <param name="publicKey">Sets the public key of recaptcha.</param>
        /// <param name="theme">Sets the theme of recaptcha.</param>
        /// <param name="language">Sets the language of recaptcha. If no language is specified, the language of the current UI culture will be used.</param>
        /// <param name="tabIndex">Sets the tab index of recaptcha.</param>
        /// <param name="useSsl">Sets the value to the UseSsl property.</param>
        /// <returns>Returns an instance of the IHtmlString type.</returns>
        public static IHtmlString Recaptcha(
            this HtmlHelper htmlHelper,
            string publicKey = "{recaptchaPublicKey}",
            RecaptchaTheme theme = RecaptchaTheme.Red,
            string language = null,
            int tabIndex = 0,
            bool useSsl = false)
        {
            RecaptchaHtmlHelper rHtmlHelper = new RecaptchaHtmlHelper(publicKey, theme, language, tabIndex, useSsl);

            HtmlTextWriter writer = new HtmlTextWriter(new StringWriter());
            writer.Write(rHtmlHelper.ToString());

            return htmlHelper.Raw(writer.InnerWriter.ToString());
        }
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 /// <summary>
 /// Redners the HTML output. This method is automatically called by ASP.NET during the rendering process.
 /// </summary>
 /// <param name="output">The output object to which the method will write HTML to.</param>
 /// <exception cref="InvalidOperationException">The exception is thrown if the public key is not set.</exception>
 protected override void RenderContents(HtmlTextWriter output)
 {
     if (this.DesignMode)
     {
         output.Write("<p>Recaptcha Control</p>");
     }
     else
     {
         RecaptchaHtmlHelper htmlHelper = new RecaptchaHtmlHelper(this.PublicKey, this.Theme, this.Language, this.TabIndex);
         output.Write(htmlHelper.ToString());
     }
 }
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        /// <summary>
        /// Redners the HTML output. This method is automatically called by ASP.NET during the rendering process.
        /// </summary>
        /// <param name="output">The output object to which the method will write HTML to.</param>
        /// <exception cref="InvalidOperationException">The exception is thrown if the public key is not set.</exception>
        protected override void RenderContents(HtmlTextWriter output)
        {
            if (this.DesignMode)
            {
                output.Write("<p>Recaptcha Control</p>");
            }
            else
            {
                IRecaptchaHtmlHelper htmlHelper = null;

                string apiVersion = RecaptchaKeyHelper.ParseKey(ApiVersion);

                if (apiVersion != "2")
                {
                    htmlHelper = new RecaptchaHtmlHelper(this.PublicKey, this.Theme, this.Language, this.TabIndex, this.UseSsl);
                }
                else
                {
                    htmlHelper = new Recaptcha2HtmlHelper(this.PublicKey, this.Theme, this.Language, this.TabIndex, this.DataType, this.DataSize, this.UseSsl);
                }
                
                output.Write(htmlHelper.ToString());
            }
        }
        public void PublicKeyIsParsedCorrectly()
        {
            var target = new RecaptchaHtmlHelper("{TestKey}");

            Assert.AreEqual("TestValue", target.PublicKey);
        }
        public void CleanThemeIsPassedCorrectly()
        {
            var target = new RecaptchaHtmlHelper("TestKey", RecaptchaTheme.Clean, null, 0);

            Assert.AreEqual(RecaptchaTheme.Clean, target.Theme);
        }