title: Error occured in saved zip file+using Ionic.Zip
body: <p>I have many files and I want to add thems in to a new zipfile.
  I used this nameespace :
  using Ionic.Zip</p>
  
  <p>here my codes:</p>
  
  <pre><code> for (int i = 0; i &lt; deliveryList.Count; i++)
                      {
                         // System.IO.MemoryStream st = new System.IO.MemoryStream(x.Data.Data);
                          zip.AddEntry(x.StudentObj.Number.ToString() + '.' + t[t.Length -1 ],x.Data.Data);
  }
   zip.Save(Response.OutputStream); //"Archive.zip");
  </code></pre>
  
  <p>now when I open the saved zip file,this error occured:</p>
  
  <pre><code>C:\Users\Sara\AppData\Local\Microsoft\Windows\Temporary Internet Files\Content.IE5\D6IMASPE\TExamGrades.zip: The archive is either in unknown format or damaged
  </code></pre>