<div class="field"> 
    @Html.LabelForRequired(m => m.Name) 
    @Html.TextBoxFor(m => m.Name) 
    @Html.ValidationMessageFor(m => m.Name) 
</div>

public static class HtmlExtensions
{
    [SuppressMessage("Microsoft.Design", "CA1006:DoNotNestGenericTypesInMemberSignatures", Justification = "This is an appropriate nesting of generic types")]
    public static MvcHtmlString LabelForRequired<TModel, TValue>(this HtmlHelper<TModel> html, Expression<Func<TModel, TValue>> expression, string labelText = "")
    {
        return LabelHelper(html,
            ModelMetadata.FromLambdaExpression(expression, html.ViewData),
            ExpressionHelper.GetExpressionText(expression), labelText);
    }
 
    private static MvcHtmlString LabelHelper(HtmlHelper html, 
        ModelMetadata metadata, string htmlFieldName, string labelText)
    {
        if (string.IsNullOrEmpty(labelText))
        {
            labelText = metadata.DisplayName ?? metadata.PropertyName ?? htmlFieldName.Split('.').Last();
        }
 
        if (string.IsNullOrEmpty(labelText))
        {
            return MvcHtmlString.Empty;
        }
 
        bool isRequired = false;
 
        if (metadata.ContainerType != null)
        {
            isRequired = metadata.ContainerType.GetProperty(metadata.PropertyName)
                            .GetCustomAttributes(typeof(RequiredAttribute), false)
                            .Length == 1;
        }
 
        TagBuilder tag = new TagBuilder("label");
        tag.Attributes.Add(
            "for",
            TagBuilder.CreateSanitizedId(
                html.ViewContext.ViewData.TemplateInfo.GetFullHtmlFieldName(htmlFieldName)
            )
        );
 
        if (isRequired)
            tag.Attributes.Add("class", "label-required");
 
        tag.SetInnerText(labelText);
 
        var output = tag.ToString(TagRenderMode.Normal);
 
 
        if (isRequired)
        {
            var asteriskTag = new TagBuilder("span");
            asteriskTag.Attributes.Add("class", "required");
            asteriskTag.SetInnerText("*");
            output += asteriskTag.ToString(TagRenderMode.Normal);
        }
        return MvcHtmlString.Create(output);
    }
}

<div class="field"> 
    @Html.LabelForRequired(m => m.Name) 
    @Html.TextBoxFor(m => m.Name) 
    @Html.ValidationMessageFor(m => m.Name) 
</div>