Kenneth的部落格

I was having need that I need to pad number in 5 digit format. So following is a table in which format I need my leading zero format.

1-> 00001

20->00020

300->00300

4000->04000

50000->5000

So let’s create a simple console application and see how its works. Following is a code for that.

using System;
 
namespace LeadingZero
{
  class Program
  {
      static void Main(string[] args)
      {
          int a = 1;
          int b = 20;
          int c = 300;
          int d = 4000;
          int e = 50000;
 
          Console.WriteLine(string.Format("{0}------>{1}",a,a.ToString("D5")));
          Console.WriteLine(string.Format("{0}------>{1}", b, b.ToString("D5")));
          Console.WriteLine(string.Format("{0}------>{1}", c, c.ToString("D5")));
          Console.WriteLine(string.Format("{0}------>{1}", d, d.ToString("D5")));
          Console.WriteLine(string.Format("{0}------>{1}", e, e.ToString("D5")));
          Console.ReadKey();
      }
  }
}

As you can see in the above code I have use string.Format function to display value of integer and after using integer value’s ToString method. Now Let’s run the console application and following is the output as expected.