How to get available TCP port

In the server, I use StreamSocketListener's BindServiceNameAsync() to bind the port, but i don't know which port is available.
How can i get an available port ?
mStreamSocketListener.BindServiceNameAsync("123");

Hi oneonce,
Is that means you would like to know if "123" port is available on current OS programmatically by Windows Store App?
Base on my understanding, Windows Store App runs in a sandbox mode to ensure safety, we do not have any permission to know if system have the Tcp port open, meanwhile TcpConnectionInformation
Class does not supported in Windows Store App.
The answer for this question is we do not have any way to detect that.
However I'm not sure why you ask such question, let's say if we know that "123" port is not available in local machine, will you change to another TCP port?
--James
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How to get available TCP port

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