[HELP] Interfacing HCSR04 to VB.NET

I am creating a Parking System. I use Ultrasonic Sensor to sense if there is a Car Parked to a Parking Slot.

Here is my Arduino Sketch.

#define trigPin 3
#define echoPin 2

void setup() {
  Serial.begin (9600);
  pinMode(trigPin, OUTPUT);
  pinMode(echoPin, INPUT);
}

void loop() {
  int duration, distance;
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(1000);
  digitalWrite(trigPin, LOW);
  duration = pulseIn(echoPin, HIGH);
  distance = (duration/2) / 29.1;
  Serial.print(distance);
  Serial.println(" cm");
  delay(100);
}

How can I read the Distance Values for VB.NET. I really need Help . THANK YOU .