CheckBoxList Helper extension method ASP.NET MVC 3

Here's a quick and dirty html helper for checkboxes in ASP.NET MVC 3. I'm sure Microsoft will eventually package one with the MVC framework just like they will a radiobuttonlist helper, but in the meantime, this one suits my purposes.

Of course, from a front-end point of view, a multi-select listbox is also an option, but checkboxes are a little more robust when it comes to user interaction. Nothing is more annoying as a user than forgetting to ctrl-click and having all your previous selections disappear.

You can probably find variations around, most that I've seen use a generic list of a custom class - mine uses a MultiSelectList instead, just for fun.

public static class NSCheckboxListExtensions
public static MvcHtmlString CheckboxListFor<TModel, TProperty>(
this HtmlHelper<TModel> htmlHelper,
Expression<Func<TModel, TProperty>> expression,
MultiSelectList listOfValues)
var metaData = ModelMetadata.FromLambdaExpression(expression, htmlHelper.ViewData);
var sb = new StringBuilder();

if (listOfValues != null)
foreach (var item in listOfValues)
var id = string.Format("{0}_{1}", htmlHelper.ViewContext.ViewData.TemplateInfo.GetFullHtmlFieldId(ExpressionHelper.GetExpressionText(expression)), item.Value);
var name = htmlHelper.ViewContext.ViewData.TemplateInfo.GetFullHtmlFieldId(ExpressionHelper.GetExpressionText(expression));
var label = htmlHelper.Label(id, HttpUtility.HtmlEncode(item.Text));

var cb = new TagBuilder("input");
cb.MergeAttribute("type", "checkbox");
cb.MergeAttribute("name", name);
cb.MergeAttribute("value", @item.Value);
cb.MergeAttribute("id", id);
if (@item.Selected)
cb.MergeAttribute("checked", "checked");
sb.AppendFormat("{0}{1}</br>", cb, label);
return MvcHtmlString.Create(sb.ToString());