MVC3 Bulk Edit Checkbox HtmlHelper

BulkEditCheckBoxExtensions.cs

public static class BulkEditCheckBoxExtensions
{
    public static MvcHtmlString BulkEditCheckBoxFor<TModel, TProperty>(
        this HtmlHelper<TModel> htmlHelper, Expression<Func<TModel, TProperty>> expression)
        where TModel : IBulkEditViewModel
    {
        var metadata = ModelMetadata.FromLambdaExpression(expression, htmlHelper.ViewData);
        var model = htmlHelper.ViewData.Model as IBulkEditViewModel;
        var modelPropertyName = metadata.PropertyName;

        var tagBuilder = new TagBuilder("input");
        tagBuilder.Attributes.Add("type", "checkbox");
        tagBuilder.Attributes.Add("name", "FieldsToUpdate");
        tagBuilder.Attributes.Add("value", modelPropertyName);

        if (model.FieldsToUpdate != null && model.FieldsToUpdate.Contains(modelPropertyName))
        {
            tagBuilder.Attributes.Add("checked", "checked");
        }

        return MvcHtmlString.Create(tagBuilder.ToString());
    }
}

IBulkEditViewModel.cs

public interface IBulkEditViewModel
{
    List<string> FieldsToUpdate { get; set; }
}

This was for a mechanism to add a "Bulk Edit" checkbox to each field in an MVC View, returns a list of fields that have the checkbox checked.