Easy Bundles for .NET MVC4 - Blog post with explanation here: http://chris-barr.com/2013/04/easy-bundles-for-net-mvc4/ ‎

BundleHelpers.cs

using System.Linq;
using System.Web.Optimization;

namespace System.Web.Mvc
{
    public static class HtmlHelperExtensions
    {

        public static IHtmlString Script(this HtmlHelper helper, params string[] urls)
    {
        var bundleDirectory = "~/Scripts/bundles/" + MakeBundleName(".js", urls);
        var thisBundle = new ScriptBundle(bundleDirectory).Include(urls);
        BundleTable.Bundles.Add(thisBundle);

        return Scripts.Render(bundleDirectory);
    }

    public static IHtmlString Style(this HtmlHelper helper, params string[] urls)
    {
        var bundleDirectory = "~/Styles/bundles/" + MakeBundleName(".css", urls);
        var thisBundle = new StyleBundle(bundleDirectory).Include(urls);
        BundleTable.Bundles.Add(thisBundle);

        return Styles.Render(bundleDirectory);
    }

    private static string MakeBundleName(string type, params string[] urls)
    {
        var bundleSections = new List<string>();

        foreach (var item in urls)
        {
            bundleSections.Add(item.Replace("~/", "").Replace("/", ".").Replace(type, ""));
        }

        return string.Join("+", bundleSections.ToArray());
    }
    }
}

example.cshtml

//Syntax usage example
@Html.Style("~/Styles/someFile.css")
@Html.Script("~/Scripts/foo.js", "~/Scripts/bar.js")