How do I detect Serial Port status after COM port lost and re-connection

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serial-port

communication

ports

so I have an C# WinForm that use

SerialPort SerialPort1 = new SerialPort("COM1", 9600, Parity.None, 8, StopBits.One);
SerialPort1.Open()
SerialPort1.DataReceived += new SerialDataReceivedEventHandler(...)

to listen on several Virtual COM Ports that Created by other Software(I can't control it)

So generally it goes well except When the other Software is dead or gone, the Virtual COM port it created is also gone or missing

So my WinForm App fail of course because there is no COM1 to listen to

Question: How should I detect when there is no COM port to listen??

SerialPort1.IsOpen() still return true, SerialPort1 != null

Thank you so much for your reply