Most efficient way of reading data from a stream

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You could read in chunks:

using (var stream = new MemoryStream())
{
    byte[] buffer = new byte[2048]; // read in chunks of 2KB
    int bytesRead;
    while((bytesRead = cs.Read(buffer, 0, buffer.Length)) > 0)
    {
        stream.Write(buffer, 0, bytesRead);
    }
    byte[] result = stream.ToArray();
    // TODO: do something with the result
}

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