How to encrypt a zip file using PGP Encryption?

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encryption

How to encrypt a zip file using PGP Encryption?

I am able to encrypt a text file as per the below code. But unable to encrypt a zip file though.

private void encryptnew()
       {
           FileInfo fi = new FileInfo(path1);


           //GetFile();

           string path = ConfigurationSettings.AppSettings["NEW_FILE"].ToString();
           // Delete the file if it exists.
           if (File.Exists(path))
           {
               File.Delete(path);
           }

           //Create the file.
           using (FileStream fs = fi.Create())
           {
               Byte[] info = new UTF8Encoding(true).GetBytes("This is some text in the file.");
               // Add some information to the file.
               fs.Write(info, 0, info.Length);
               fs.Flush();
               fs.Close();

               FileStream str = new FileStream(path, FileMode.Create);
               PgpEncryptionKeys objPgpEncryptionKeys = new PgpEncryptionKeys(PublicKey, PrivateKey, password, true);
               PgpEncrypt objPgpEncrypt = new PgpEncrypt(objPgpEncryptionKeys);
               objPgpEncrypt.EncryptAndSign(str, fi);
               str.Flush();
               str.Close();
           }
       }