Create a zip file download it

Need to have "ICSharpCode.SharpZipLib.dll" to make it

Here MatchCollection is document paths.

private void DownloadZipToBrowser(MatchCollection matches,SPWeb web)
        {
 
            Response.ContentType = "application/zip";
            // If the browser is receiving a mangled zipfile, IIS Compression may cause this problem. Some members have found that
            //    Response.ContentType = "application/octet-stream"     has solved this. May be specific to Internet Explorer.
 
            Response.AppendHeader("content-disposition", "attachment; filename=\"Memo.zip\"");
            Response.CacheControl = "Private";
            Response.Cache.SetExpires(DateTime.Now.AddMinutes(3)); // or put a timestamp in the filename in the content-disposition
 
            byte[] buffer = new byte[4096];
 
            ZipOutputStream zipOutputStream = new ZipOutputStream(Response.OutputStream);
            zipOutputStream.SetLevel(3); //0-9, 9 being the highest level of compression
            foreach (Match m in matches)
            {
                SPFile oFile = web.GetFile(m.Result("${url}"));
                Stream fs = oFile.OpenBinaryStream();
                //Stream fs = File.OpenRead(fileName);    // or any suitable inputstream
 
                ZipEntry entry = new ZipEntry(ZipEntry.CleanName(oFile.Name));
                entry.Size = fs.Length;
                // Setting the Size provides WinXP built-in extractor compatibility,
                //  but if not available, you can set zipOutputStream.UseZip64 = UseZip64.Off instead.
 
                zipOutputStream.PutNextEntry(entry);
                buffer = new byte[fs.Length];
                int count = fs.Read(buffer, 0, buffer.Length);
                while (count > 0)
                {
                    zipOutputStream.Write(buffer, 0, count);
                    count = fs.Read(buffer, 0, buffer.Length);
                    if (!Response.IsClientConnected)
                    {
                        break;
                    }
                    Response.Flush();
                }
                fs.Close();
            }
            zipOutputStream.Close();
 
            Response.Flush();
            Response.End();
        }