Score display in specific format

I want to display game score in thousand separator format. I have written this kind of code for this purpose.

string format = "0,000,000";
gamePlayScoreText.text = GameManager.Instance.GamePlayScore.ToString (format);

By this code, I was getting this kind of output:
0,002,810

So from this, I want to remove leading zeros so my actual output will be: 2,810
So please give me some suggestion for this.

I am pasting this answer to help other members but really thanks to @chillersanim for his awesome help.

I just converted my code to like this and its satisfy my requirement:

string format = "#,###,###";
gamePlayScoreText.text = GameManager.Instance.GamePlayScore.ToString (format);

Proper documentation, you can found here:

Custom Numeric Format Strings