How to display the number “12” in the format of “0000012”

How to display the number “12” in the format of “0000012” Usi开发者_开发百科ng C#

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var str = string.Format("{0:d7}", 12);

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var formatted = String.Format("{0:0000000}", 12);

or

Console.WriteLine("{0:0000000}", 12);

I will add that if "12" is a string (it's in double quotes)

var formatted = "12".PadLeft(7, '0');

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var a = 12;
var b = a.ToString("D7");

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int a = 12;
string b = a.ToString("0000000");