Problem in GZipStream Class

Hi All,

I want to compress some data and send it to a web service as string and decompress it there and use it.

I use GZipStream class for this and i'm getting an error "The magic number in GZip header is not correct. Make sure you are passing in a GZip stream" when i try to read from the stream.

However i dont get this error when i send the stream as byte array.The problem comes only when i convert the compressed stream to string and try to read it (decompress it).

Here is the code

public static string Compress(string data)

{

byte[] buffer = Encoding.ASCII.GetBytes(data);

MemoryStream ms = new MemoryStream();

GZipStream compressedZipStream = new GZipStream(ms, CompressionMode.Compress, true);

byte[] outBuffer = ms.ToArray();

string cData = Encoding.UTF8.GetString(outBuffer);

return cData;

public static string DeCompress(string data)

byte[] buffer = Encoding.UTF8.GetBytes(data);

MemoryStream ms = new MemoryStream(buffer);

GZipStream zipStream = new GZipStream(ms, CompressionMode.Decompress);

byte[] decompressedBuffer = new byte[buffer.Length + 100];

// Use the ReadAllBytesFromStream to read the stream.

int totalCount = ReadAllBytesFromStream(zipStream, decompressedBuffer);

string dData = Encoding.UTF8.GetString(decompressedBuffer);

return dData;

private static int ReadAllBytesFromStream(Stream stream, byte[] buffer)

// Use this method is used to read all bytes from a stream.

int offset = 0;

int totalCount = 0;

while (true)

try

int bytesRead = stream.Read(buffer, offset, 100);

if (bytesRead == 0)

break;

catch(Exception ex) { break; }

return totalCount;

Suresh.