add commas using String.Format for number and

Question

Using String.Format how can i ensure all numbers have commas after every 3 digits eg 23000 = \"23,000\" and that 0 returns \"0\".

String.Format(\"{0:n}\", 0); //give

Answer 1

I up-marked another answer and then found that zero values are an empty string.

        System.Globalization.CultureInfo ci = new System.Globalization.CultureInfo("de-DE");
        System.Threading.Thread.CurrentThread.CurrentCulture = ci;

        double x = 23232323.21;
        string y = x.ToString("#,0", System.Globalization.CultureInfo.CurrentCulture);

The string is returned in the current culture which is German therefore y = 23.232.323

y = 0 when x = 0.