Html Helper class to add ASP.NET MVC error messages to a label wrapper class

BlockLabelExtensions.cs

using System.Linq;
using System.Linq.Expressions;

namespace System.Web.Mvc.Html
{
    public static class BlockLabelExtensions
    {
        public static IDisposable BeginBlockLabel<TModel, TValue>(this HtmlHelper<TModel> html, Expression<Func<TModel, TValue>> expression)
        {
            string expressionText = ExpressionHelper.GetExpressionText(expression);
            MvcHtmlString labelString = LabelValueHelper(
                html,
                ModelMetadata.FromLambdaExpression(expression, html.ViewData),
                expressionText);

            bool isValid = html.ViewData.ModelState.IsValidField(expressionText);

            return new LabelWrapper(html, isValid, labelString);
        }

        internal static MvcHtmlString LabelValueHelper(HtmlHelper html, ModelMetadata metadata, string htmlFieldName)
        {
            string resolvedLabelText = metadata.DisplayName ?? metadata.PropertyName ?? htmlFieldName.Split('.').Last();

            if (String.IsNullOrEmpty(resolvedLabelText))
            {
                return MvcHtmlString.Empty;
            }

            return new MvcHtmlString(resolvedLabelText);
        }

        private class LabelWrapper : IDisposable
        {
            private readonly HtmlHelper htmlHelper;

            public LabelWrapper(HtmlHelper html, bool isValid, MvcHtmlString labelText)
            {
                TagBuilder tagBuilder = new TagBuilder("label");
                if (!isValid)
                {
                    tagBuilder.AddCssClass("error");
                }

                html.ViewContext.Writer.Write(tagBuilder.ToString(TagRenderMode.StartTag));
                html.ViewContext.Writer.Write(labelText);
                this.htmlHelper = html;
            }

            public void Dispose()
            {
                this.htmlHelper.ViewContext.Writer.Write("</label>");
            }
        }
    }
}

usage.cshtml

  @using (Html.BeginBlockLabel(m => m.Email))
  {
      @Html.ValidationMessageFor(m => m.Email, "", new { @class = "validation" })
      @Html.EmailFor(m => m.Email)
  }