asp.net mvc HtmlHelperExt EnumDropDownList

public static class HtmlHelperExt
{
public static MvcHtmlString EnumDropDownList<TEnum>(this HtmlHelper htmlHelper, string name, TEnum selectedValue)
{
IEnumerable<TEnum> values = Enum.GetValues(typeof (TEnum))
.Cast<TEnum>();

IEnumerable<SelectListItem> items =
from value in values
select new SelectListItem
{
Text = value.ToString(),
Value = value.ToString(),
Selected = (value.Equals(selectedValue))
};

return htmlHelper.DropDownList(
name,
items
);
}

public static MvcHtmlString EnumDropDownListFor<TModel, TEnum>(this HtmlHelper<TModel> htmlHelper,
Expression<Func<TModel, TEnum>> expression)
{
ModelMetadata metadata = ModelMetadata.FromLambdaExpression(expression, htmlHelper.ViewData);
IEnumerable<TEnum> values = Enum.GetValues(typeof (TEnum)).Cast<TEnum>();

IEnumerable<SelectListItem> items =
values.Select(value => new SelectListItem
{
Text = value.ToString(),
Value = value.ToString(),
Selected = value.Equals(metadata.Model)
});

return htmlHelper.DropDownListFor(
expression,
items
);
}
}