The .NET Framework provides the format strings like “D” and “X” which can be easily used by the developers to format the number with leading zeroes in C#.

For example , assume that the number is 589 and you want it to print as 00589 , you could use the format specifier “D5” where 5 is the total number of digits of the number to output.

Formatting Number with Leading Zeroes in C#

using System;
using System.Collections.Generic;
using System.Globalization;
using System.Linq;
using System.Text;

namespace GinktageApp
{
    internal class Program
    {
        private static void Main(string[] args)
        {
            int InputNumber = 00589;
            Console.WriteLine(InputNumber.ToString("D5", CultureInfo.InvariantCulture));
            Console.ReadLine();
        }
    }
    
}