How to catch serial.println("a"); in vb.net?

Projects Interfacing w/ Software on the Computer
1

Hi guys can you help me how to catch serial.println in vb.net?

Arduino Code

if (buttonState == HIGH) {
// turn LED on:
digitalWrite(ledPin, HIGH);
Serial.println("a");
delay(100);
}
else {
// turn LED off:
digitalWrite(ledPin, LOW);
Serial.println("b");
}
2
3

And use the VB Serial event method to catch the incoming byte when they arrive.