ASP.NET - get relative path to files in a specific folder

FindRelativePathsToFilteredFolderFiles.cs

private IEnumerable<string> GetRelativePathsToRoot(string virtualPath, string filter)
{
	var physicalPath = Server.MapPath(virtualPath);
	var absolutePaths = Directory.EnumerateFiles(
		physicalPath, 
		filter, 
		SearchOption.AllDirectories
	);
	return absolutePaths.Select(
		x => Url.Content(virtualPath + x.Replace(physicalPath, ""))
	);
}