Bundle Extension for versioning

BundleConfig.cs

using System.Web.Optimization;
using MyProject.Extensions;
namespace MyProject
{
    public class BundleConfig
    {
        // For more information on bundling, visit http://go.microsoft.com/fwlink/?LinkId=301862
        public static void RegisterBundles(BundleCollection bundles)
        {
            bundles.Add(new ScriptBundle("~/bundles/jquery").Include(
                        @"~/Scripts/jquery-{version}.js"));

            bundles.Add(new ScriptBundle("~/bundles/jqueryval").Include(
                        @"~/Scripts/jquery.validate*"));

            bundles.Add(new ScriptBundle("~/bundles/jqueryvalnative")
                .Include("~/Scripts/jquery.validate.js"));

            // Use the development version of Modernizr to develop with and learn from. Then, when you're
            // ready for production, use the build tool at http://modernizr.com to pick only the tests you need.
            bundles.Add(new ScriptBundle("~/bundles/modernizr").Include(
                        @"~/Scripts/modernizr-*"));

            bundles.Add(new ScriptBundle("~/bundles/bootstrap").Include(
                      @"~/Scripts/bootstrap.js",
                      @"~/Scripts/respond.js",
                      @"~/Scripts/sweet-alert.js",
                      @"~/Scripts/bootstrap-slider.js",
                      @"~/Scripts/moment.js",
                      @"~/Scripts/daterangepicker.js",
                      @"~/Scripts/masterlayout.js").WithLastModifiedToken());

      
            bundles.Add(new StyleBundle("~/Content/css").Include(
                      @"~/Content/bootstrap.css",
                      @"~/Content/bootstrap-flat.css",
                      @"~/Content/bootstrap-flat-extras.css",
                      @"~/Content/bootstrap-tab-extras.css",
                      @"~/Content/bootstrap-slider.css",
                      @"~/Content/daterangepicker.css",
                      @"~/Content/site.css",
                      @"~/Content/sweet-alert.css").WithLastModifiedToken());

            bundles.Add(new ScriptBundle("~/bundles/jqueryextras").Include(
                @"~/Scripts/jquery-ui-1.9.2.js",
                @"~/Scripts/jquery.hint.js",
                @"~/Scripts/jquery.format.js",
                @"~/Scripts/jquery.fileupload.js").WithLastModifiedToken());
 
            bundles.Add(new ScriptBundle("~/bundles/knockout").Include(
                @"~/Scripts/knockout-3.4.1.js",
                @"~/Scripts/knockout.mapping-latest.js").WithLastModifiedToken());
        }
    }
}

BundleExtensions.cs

using System;
using System.Web.Optimization;
using System.IO;
using System.Web.Hosting;

namespace MyProject.Extensions
{
    internal static class BundleExtensions
    {
        /// <summary>
        /// Versioning for Bundles
        /// Source: H-Dog's answer  https://stackoverflow.com/questions/15005481/mvc4-stylebundle-can-you-add-a-cache-busting-query-string-in-debug-mode
        /// </summary>
        /// <param name="sb"></param>
        /// <returns></returns>
        public static Bundle WithLastModifiedToken(this Bundle sb)
        {
            sb.Transforms.Add(new LastModifiedBundleTransform());
            return sb;
        }
        public class LastModifiedBundleTransform : IBundleTransform
        {
            public void Process(BundleContext context, BundleResponse response)
            {
                foreach (var file in response.Files)
                {
                    var lastWrite = File.GetLastWriteTime(HostingEnvironment.MapPath(file.IncludedVirtualPath)).Ticks.ToString();
                    file.IncludedVirtualPath = string.Concat(file.IncludedVirtualPath, "?v=", lastWrite);
                }
            }
        }
    }
}