Riddle me this, why won’t this code work?
time to read 2 min | 305 words

The following code will not result in the expected output:

using(var mem = new MemoryStream())
{
    using(var gzip = new GZipStream(mem, CompressionMode.Compress, leaveOpen:true))
    {
        gzip.WriteByte(1);
        gzip.WriteByte(2);
        gzip.WriteByte(1);
        gzip.Flush();
    }
    
    using (var gzip = new GZipStream(mem, CompressionMode.Compress, leaveOpen: true))
    {
        gzip.WriteByte(2);
        gzip.WriteByte(1);
        gzip.WriteByte(2);
        gzip.Flush();
    }

    mem.Position = 0;

    using (var gzip = new GZipStream(mem, CompressionMode.Decompress, leaveOpen: true))
    {
        Console.WriteLine(gzip.ReadByte());
        Console.WriteLine(gzip.ReadByte());
        Console.WriteLine(gzip.ReadByte());
    }


    using (var gzip = new GZipStream(mem, CompressionMode.Decompress, leaveOpen: true))
    {
        Console.WriteLine(gzip.ReadByte());
        Console.WriteLine(gzip.ReadByte());
        Console.WriteLine(gzip.ReadByte());
    }
}

Why? And what can be done to solve this?

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