Essential Types C# Book

Letter Meaning
N Fixed point with numeric group separator
using System;
using System.Text;
using System.Globalization;
class Sample
{
public static void Main()
{
Console.WriteLine("{0:N2}", 11111.2345);
Console.WriteLine("{0:N2}", 11110.00001);
}
}
The output:
11,111.23
11,110.00
N2 rounds values to two decimal places and add group (1,000s) separator.