/// <summary>
/// Renders a hidden form field that contains a value encrypted with AES. The key for the encryption must
/// be set in your web.config with the <see cref="CryptoConfigurationSection"/>.
/// </summary>
/// <param name="html">The <see cref="HtmlHelper"/></param>
/// <param name="name">The name of the field</param>
/// <param name="value">The value to encrypt</param>
/// <param name="htmlAttributes">An object containing the HTML attributes for the element.</param>
/// <returns>The HTML</returns>
public static MvcHtmlString EncryptedHidden(this HtmlHelper html, string name, string value, IDictionary <string, object> htmlAttributes)
{
string encryptedValue;
using (ICrypto crypto = new AesCrypto())
{
encryptedValue = crypto.EncryptToBase64(value);
}
return(html.Hidden(name, encryptedValue, htmlAttributes));
}