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var name = SerialPort.GetPortNames()[0];
this.SerialPort = new SerialPort { PortName = name, DataBits = 8, BaudRate = 9600, Parity = Parity.None, StopBits = StopBits.One };
this.SerialPort.DataReceived += (s, e) =>
{
this.TestText = ((SerialPort)s).ReadExisting();
};
this.SerialPort.Open();