NetworkStream and TcpClient : read only necessary datas

Hi Experts,

I need to read my networkstream, so I do like this:
byte[] bytes = new byte[tcpClient.ReceiveBufferSize];
networkStream.Read(bytes, 0, tcpClient.ReceiveBufferSize);

The problem is that the buffer size (8192) > my datas(20).
So, finally I read the networkstream and I get a string length=8192 instead of a string length=20.

How can I get the only datas I need ?

Thanks in advance for your help.
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The System.Net.Sockets.NetworkStream.Read method returns an integer reporting the number of bytes that were actually received:

  byte[] bytes = new byte[tcpClient.ReceiveBufferSize];

  int received = networkStream.Read(bytes, 0, tcpClient.ReceiveBufferSize);
  byte[] data = new byte[received];
  System.Array.Copy(bytes, data, received);

In this example, if 20 bytes of data were actually received, the 'data' array would have only have 20 elements.

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