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Editorial Team
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Asked: 2026-05-19T03:05:55+00:00

I am writing a C# .NET server application that sends and receives data over

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I am writing a C# .NET server application that sends and receives data over Sockets, and I am having some issues if the client application crashes without closing the socket the right way.

I have set the ‘receive timeout’ to a given value, and I expected the Socket.Receive() to throw an exception after that amount of time. But instead the method just returns 0.

So my question is: Is it possible that the socket is still open if the Socket.Receive() returns 0? Or can I safely assume that it is down?

(Might be a bit tricky to understand. If so, please let me know in the comments)

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1 Answer

  1. Editorial Team

    Nope. It’s down if you receive 0.

    From MSDN:

    If the remote host shuts down the Socket connection with the Shutdown method, and all available data has been received, the Receive method will complete immediately and return zero bytes.

    http://msdn.microsoft.com/en-us/library/8s4y8aff.aspx

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