Token Replacement

public static MvcHtmlString ReplaceTokens(this HtmlHelper helper)
        {
            var tag = new TagBuilder("input");
            tag.Attributes["type"] = "hidden";
            tag.Attributes["name"] = "uid";
            tag.Attributes["value"] = helper.Sitecore().CurrentRendering.UniqueId.ToString();
            return new MvcHtmlString(tag.ToString(TagRenderMode.SelfClosing));
        }