MVC Mandatory Field Label For Helper

LabelExtensions.cs

using System;
using System.Linq;
using System.Linq.Expressions;
using System.Web.Mvc;
using System.Web.WebPages;

namespace RegistrationSample.UI.Web.mvcHelper
{
    /// <summary>
    /// Mandatory Field Extension
    /// @Html.MandatoryLabelFor(m => m.JobTitle, @<span style='color: red;'>*</span>)
    /// </summary>
    public static class LabelExtensions
    {
        public static MvcHtmlString MandatoryLabelFor<TModel, TProperty>(this HtmlHelper<TModel> htmlHelper,
            Expression<Func<TModel, TProperty>> lambdaExpr,          //m => m.JobTitle
            Func<object, HelperResult> template                      //@<span>Hello World</span>
        )
        {
            var htmlFieldName = ExpressionHelper.GetExpressionText(lambdaExpr);
            var fullHtmlFieldName = htmlHelper.ViewContext.ViewData.TemplateInfo.GetFullHtmlFieldName(htmlFieldName);

            ModelMetadata metadata = ModelMetadata.FromLambdaExpression(lambdaExpr, htmlHelper.ViewData);
            string labelText = metadata.DisplayName ?? metadata.PropertyName ?? htmlFieldName.Split('.').Last(); 

            var label = new TagBuilder("label");
            label.Attributes["for"] = TagBuilder.CreateSanitizedId(fullHtmlFieldName);
            label.InnerHtml = labelText + " " + template(null).ToHtmlString();
                
            return MvcHtmlString.Create(label.ToString());
        }
    }
}