ASP.NET MVC - Output full-HTML validation errors

gistfile1.cs

	public static class ValidationExtensions
	{
		public static MvcHtmlString ValidationMessageHtmlFor<TModel, TProperty>(
			this HtmlHelper<TModel> htmlHelper,
			Expression<Func<TModel, TProperty>> expression,
			bool htmlEncode)
		{
			return new MvcHtmlString(
				HttpUtility.HtmlDecode(
					htmlHelper.ValidationMessageFor<TModel, TProperty>(
						expression, 
						null, 
						((IDictionary<string, object>)new RouteValueDictionary()))
							.ToHtmlString()));
		}
	}