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I’m using the SerialDataReceivedEventHandler to know when my SerialPort object receives data.
Is it possible to know when I won’t be receiving anymore data because the inter-byte timeout has occurred?
No, a TimeoutException is only raised when you call Read() and there is no data to read. The DataReceived event is fired when there is data available so the Read() call can never raise that exception.
A simple workaround is to use your own Timer. Call its Stop() and Start() method in your event handler to reset the timer. And declare failure when its Tick event fires.