The precision specifier controls the number of significant digits or zeros to the right of a decimal:

     
using System;

public class FormatSpecApp {
    public static void Main(string[] args) {
        int i = 123456;
        
        Console.WriteLine("{0:C5}", i);
        Console.WriteLine("{0:D5}", i);
        Console.WriteLine("{0:E5}", i);
        Console.WriteLine("{0:F5}", i);
        Console.WriteLine("{0:G5}", i);
        Console.WriteLine("{0:N5}", i);
        Console.WriteLine("{0:P5}", i);
        Console.WriteLine("{0:X5}", i);
    }
}

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The precision specifier controls the number of significant digits or zeros to the right of a decimal: : int « Data Types « C# / C Sharp

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