Compress a strings using C#

using (GZipStream zip = new GZipStream(ms, CompressionMode.Compress, true))

{

zip.Write(buffer, 0, buffer.Length);

}

ms.Position = 0;

MemoryStream outStream = new MemoryStream();

byte[] compressed = new byte[ms.Length];

ms.Read(compressed, 0, compressed.Length);

byte[] gzBuffer = new byte[compressed.Length + 4];

System.Buffer.BlockCopy(compressed, 0, gzBuffer, 4, compressed.Length);

System.Buffer.BlockCopy(BitConverter.GetBytes(buffer.Length), 0, gzBuffer, 0, 4);

return Convert.ToBase64String(gzBuffer);

}