Using GzipStream to zip up more then one file

Question

Most of the samples i been finding just relate to one file. What if I needed more then one file zip up.

 TextWriter wr;
            
            for (int i = 0; i < 4; i++)
            {
                wr = File.CreateText(@"code\code" + i + ".txt");
                wr.WriteLine("This would be a Text File");
                wr.Flush();
                wr.Close();
                wr.Dispose();
            }
            //Zip up the files (counted 4 files total)
            try
            {
       
            }
            catch
            {
                // Couldn't compress.
            }

How could I zip up all 4 text files and put them in all one zip file.

Joe