Answer by user156862 for Formatting C# output

Take a look at http://msdn.microsoft.com/en-us/library/0c899ak8.aspx

This should do what you want:

        int num = 10;

        Console.WriteLine(num.ToString("0#"));

        Console.ReadLine();

The string that is passed to the ToString method "0#" has the following meaning:

0 - 0 place holder, this will be replaced with relevant digit if one exists
# - digit place holder.

So if num is 0, 00 will be written to the console but if num is 10, 10 will be written to the console.