How to add leading zeros to a number

I saw the question “How to add leading zeros to a number” on the ASP.NET forums countless times before. And often the answers provide solutions that work, but are overkill as well.

The two cleanest methods I know are String.Format and PadLeft.

   1:  Console.WriteLine("Using .ToString()");

   2:  Console.WriteLine(String.Format("{0:0000}", 16));

   3:   

   4:  Console.WriteLine("-------------------");

   5:   

   6:  Console.WriteLine("Using .PadLeft()");

   7:  Console.WriteLine(Convert.ToString(16).PadLeft(4, '0'));

You can see the result here.

//Using .ToString()

//0016

//-------------------

//Using .PadLeft()

//0016