using System.IO;
using System.IO.Compression;

namespace DocumentationExamples
{

    class Zip
    {
        static void Main(string[] args)
        {
            using (FileStream zipToOpen = new FileStream(@"c:\users\exampleuser\release.zip", FileMode.Open))
            {
                using (ZipArchive archive = new ZipArchive(zipToOpen, ZipArchiveMode.Update))
                {
                    ZipArchiveEntry emptyEntry = archive.CreateEntry("Empty.txt");    // "Empty zip File Archived (C#)" warning issued here
                                                                                      // - no contents written to this zip archive
                    ZipArchiveEntry emptyEntry1 = archive.CreateEntry("Empty1.txt");  // "Empty zip File Archived (C#)" warning issued here
                                                                                      // - stream writer is then opened, but no contents written 
                    using (StreamWriter writer = new StreamWriter(emptyEntry1.Open()))
                    {
                    }
                    ZipArchiveEntry readmeEntry = archive.CreateEntry("Readme.txt");                      // ok: contents subsequently written
                    using (StreamWriter writer = new StreamWriter(readmeEntry.Open()))
                    {
                        writer.WriteLine("Information about this package.");
                        writer.WriteLine("========================");
                    }
                }
            }
        }
    }
    
}