String format in .NET: convert integer to fixed width string?

Another option would be:

i.ToString("d3")

The simplest way to do this is use .NET's built-in functionality for this:

var r = 10;
var p = r.ToString("000");

No need for looping or padding.

Take a look at PadLeft.

ex:

int i = 40;

string s = i.ToString().PadLeft(3, '0');

s == "040"

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