using System;

using System.Web.Mvc;

using System.Collections.Generic;

using Ionic.Zip;

using System.IO;

​

namespace ZipDemo

{

    public class HomeController : Controller

    {

        [HttpGet]

        public ActionResult Index()

        {

            return View();

        }

​

        [HttpPost]

        public FileResult Download()

        {

            var bytes = default(byte[]);

            using (var zip = new ZipFile())

            {

                zip.AddEntry("text.txt", new byte[] {});

                zip.AddEntry("text\\text.txt", new byte[] {});

                using (var ms = new MemoryStream())

                {

                    zip.Save(ms);

                    bytes = ms.ToArray();

                } 

            }       

            return File(bytes, System.Net.Mime.MediaTypeNames.Application.Zip);

        }

    }

}