System.Net.Sockets Read Unknown size of bytes

In an application I read data from the System.Net.Sockets.TCPClient buffer, but because I don't know the exact bytes to read I am having problems. The read function fires a timeout. Is there a way to read unknown bytes?
Dim bytes(tcpClient.ReceiveBufferSize) As Byte
networkStream.ReadTimeout = 20000
networkStream.Read(bytes, 0, CInt(tcpClient.ReceiveBufferSize))

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emresamisuzerAsked:
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Jaime OlivaresSoftware ArchitectCommented:
Read(), will return the number of bytes counted, so if you have a return value less than 20000, you have reached the end of the stream.
Also you can check the .DataAvailable property before trying to read.
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melmersCommented:
When you have an unknown number of bytes you can read them byte per byte from the stream
and add the byte to an array of bytes. when no bytes are on the line then you have reached the end.

The other way is to read the data async with .BeginRecive and .EndRecive when you call .EndRecive
you get the number of readed bytes as a long value.
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