Returning Multiple Files from MVC Action

public ActionResult Download()
{
    using (var memoryStream = new MemoryStream())
    {
        using (var ziparchive = new ZipArchive(memoryStream, ZipArchiveMode.Create, true))
        {
            for (int i = 0; i < 10; i++)
            {
                var readmeEntry = ziparchive.CreateEntry(string.Format("File_{0}.txt", i));
                using (StreamWriter writer = new StreamWriter(readmeEntry.Open()))
                {
                    writer.WriteLine(string.Format("File_{0} - Contents", i));
                }
            }
            ziparchive.CreateEntryFromFile(Server.MapPath("~/Files/file1.txt"), "file1.txt");
            ziparchive.CreateEntryFromFile(Server.MapPath("~/Files/file2.txt"), "file2.txt");
            ziparchive.CreateEntryFromFile(Server.MapPath("~/Files/file3.txt"), "file3.txt");
        }

        return File(memoryStream.ToArray(), "application/zip", "Attachments.zip");
    }
}

using System.IO;
using System.IO.Compression;