ASP.NET MVC: Adding aria-required attribute for required fields

http://blogs.msdn.com/b/stuartleeks/archive/2012/05/01/asp-net-mvc-adding-aria-required-attribute-for-required-fields.aspx

@{
     var attributes = new RouteValueDictionary
                          {
                             { "class", "text-box single-line"}
                          };
     if (ViewContext.ViewData.ModelMetadata.IsRequired)
     {
         attributes.Add("aria-required", "true");
     }
}
@Html.TextBox("", ViewContext.ViewData.TemplateInfo.FormattedModelValue, attributes)