GZipStream and decompression

I have code that should do the compression:

            FileStream fs = new
 FileStream("g:\\gj.txt"
, FileMode.Open);
            FileStream fd = new
 FileStream("g:\\gj.zip"
, FileMode.Create);
            GZipStream csStream = new
 GZipStream(fd, CompressionMode.Compress);


            byte
[] compressedBuffer = new
 byte
[500];
            int
 offset = 0;
            int
 nRead;

            nRead = fs.Read(compressedBuffer, offset, compressedBuffer.Length);
            while
 (nRead > 0)
            {
                csStream.Write(compressedBuffer, offset, nRead);
                if (nRead < compressedBuffer.Length) break;

               offset = offset + nRead;
                nRead = fs.Read(compressedBuffer, offset, compressedBuffer.Length);
            }


            fd.Close();
            fs.Close();

and I think it does, but I want to decompress what was compressed the way above. I do somethink like that:

            FileStream fd = new
 FileStream("g:\\gj.new"
, FileMode.Create);
            FileStream fs = new
 FileStream("g:\\gj.zip"
, FileMode.Open);
            GZipStream csStream = new
 GZipStream(fs, CompressionMode.Decompress);

            byte
[] decompressedBuffer = new
 byte
[500];
            int
 offset = 0;
            int
 nRead;

            nRead=csStream.Read(decompressedBuffer, offset, decompressedBuffer.Length);
            while
 (nRead > 0)
            {
                fd.Write(decompressedBuffer, offset, nRead);
                offset = offset + nRead;
                nRead = csStream.Read(decompressedBuffer, offset, decompressedBuffer.Length);
            }

            fd.Close();
            fs.Close();

and here it doesn't... I've got nRead = 0 befeore entering the loop... What I do wrong??
The test file I use is the simpliest TEXT file (size: 104 bytes)...

GZipStream and decompression

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