private string GetRelativePath(HttpServerUtilityBase server, BundleFile bundleFile, string filePath) { var relativeBundlePath = bundleFile.IncludedVirtualPath.Remove(bundleFile.IncludedVirtualPath.IndexOf(@"\")); var bundlePath = server.MapPath(relativeBundlePath); return FileToolkit.PathDifference(filePath, bundlePath); }