Bluetooth Module on Arduino

I have bought HC06 Bluetooth module and tried on Arduino Uno. Finally, I can turn it on and off LED by sending “1” and “2”.

I am posting here entire code and I will send here demo video as well.

int counter = 0;
char dataChar;
void setup()
{
  Serial.begin(9600);
  pinMode(8, OUTPUT);
  delay(50);
}

void loop()
{
  //counter++;
  while(Serial.available() > 0) // Don't read unless
  {
    dataChar = Serial.read(); // Read a character
    if(dataChar == '1')
    {
      Serial.write("LED ON!\n");
      digitalWrite(8, HIGH);
    }
    else if(dataChar == '2')
    {
      Serial.write("LED OFF!\n");
      digitalWrite(8, LOW);
    }
    else if(dataChar == '3')
      Serial.write("You pressed 3\n");
    else if(dataChar == '4')
      Serial.write("You pressed 4\n");
    else if(dataChar == '5')
      Serial.write("You pressed 5\n");
    else if(dataChar == '6')
      Serial.write("You pressed 6\n");
   }
  //delay(500);
  //Serial.println(counter);
}

Issue : avrdude: stk500_getsync(): not in sync: resp=0x00 error on Arduino?

Solution : I have wasted more than one hour on this silly issue not being able to upload a sketch to the arduino uno. Eventually, i took out the pin on RX and then it could upload without any problem.