Changing GUItext value

How do I change the guitext string value with a counter value?
for example:

var Counter: int=1;

function Update(){
Counter++;		GameObject.Find("Score_Text").guiText.text=Counter.ToString;
}

It gives me an error of function(): string not compatible with string value.

Thanks,

Try :

GameObject.Find("Score_Text").guiText.text=Counter.ToString();

ToString is a method, not a variable, so it need “()” after.