Create ZIP in C# | Compress Files Folders into ZIP Archive

zip-file.cs

using (FileStream zipFile = File.Open(dataDir + "CompressSingleFile_out.zip", FileMode.Create))
{
    //File to be added to archive
    using (FileStream source1 = File.Open(dataDir + "test.txt", FileMode.Open, FileAccess.Read))
    {
        using (var archive = new Archive(new ArchiveEntrySettings()))
        {
            archive.CreateEntry("test.txt", source1);

            archive.Save(zipFile);
        }
    }
}

zip-folder.cs

using (FileStream zipFile = File.Open(dataDir + "CompressDirectory_out.zip", FileMode.Create))
{
    using (Archive archive = new Archive())
    {
        DirectoryInfo corpus = new DirectoryInfo(dataDir + "zipfolder");
        archive.CreateEntries(corpus);
        archive.Save(zipFile);
    }
}

zip-multiple-files.cs

using (FileStream zipFile = File.Open(dataDir + "CompressMultipleFiles_out.zip", FileMode.Create))
{
    using (FileStream source1 = File.Open(dataDir + "test.txt", FileMode.Open, FileAccess.Read))
    {
        using (FileStream source2 = File.Open(dataDir + "test2.txt", FileMode.Open, FileAccess.Read))
        {
            using (var archive = new Archive())
            {
                archive.CreateEntry("test.txt", source1);
                archive.CreateEntry("test1.txt", source2);
                archive.Save(zipFile, new ArchiveSaveOptions() { Encoding = Encoding.ASCII, ArchiveComment = "There are two poems from Canterbury corpus" });
            }
        }
    }
}