cannot turn on LED from Arduino with Visual Basic

Projects Programming
10

Thanks to everyone

I checked according to what you said
INPUT_PULLUP
You were right it worked instead of external resistor Before that I checked with a resistor IN 5V, thanks for this advice
When I just put this code

if(digitalRead(in) == HIGH){

} else {

}

Works fine

if i put this code only
led 13 Remains off not work with statement else!

 if(value=='1'){
     //led need stay on   
    } else {
     //led need stay off   
    }

The question is whether the problem is
In Arduino or Visual Basic
What do I need to do to make it work?