DotNetZip (Ionic.Zip.dll) doesn't work with compress Chinese File or Folder name

Question

It is very perfect condition when I use as following code to compress English file or folder name,However I do have got serious problem when the name change from English to Chinese name , it isn't work.
How can i do ????

using (ZipFile zip = new ZipFile())
 {
   zip.AddDirectory(@"C:\inetpub\wwwroot\a");  // Zip folder included all branch files
   zip.Save(@"C:\inetpub\wwwroot\Projectzip.zip");//location and name for creating zip file
}

Answer 1

I've found an answer to deal with my problem

using (ZipFile zip = new ZipFile(System.Text.Encoding.Default))

thanks