Make waiting for data input from COM3 port?

Question

C++ / C#

I use using System.IO.Ports; SerialPort - Windows Forms.
When I bring the card to the reader, there is a signal, that is, data is written to the variable:

str = serialPort1.ReadExisting();

After that, in order to extract the necessary numbers, I hung a method on the button. After pressing it, the required values ​​are displayed.
Is it possible for everything to be automatically read when the card is presented, without pressing the button?

Answer 1

System.IO.Ports.SerialPort has a DataReceived event .