How to format string with spaces in C# .NET?

Question

I need help with string.format to insert three spaces every three digit. This digit is at a fixed length at 12 digits.

var membershipNo = string.Format("{0:### ### ### ###}", "123123123123");
Console.WriteLine(membershipNo);

Result: 123123123123

Expected: 123 123 123 123

0:### ### ### ### is a numeric format string, not a string format. Where are the digits in membershipNo coming from? If they're always digits why are you storing them as a string not an long? — Dour High Arch
– Dour High Arch, Commented Mar 12, 2019 at 22:03

Oleksandr · Accepted Answer · 2019-03-13 09:59:45Z

4

This type of formating doesn't work for an instance of string. Consider passing an interger (or any other numeric type) and it will work as expected

int number = 123123123123;
var membershipNo = string.Format("{0:### ### ### ###}", number);
Console.WriteLine(membershipNo);

edited Mar 13, 2019 at 9:59

answered Mar 12, 2019 at 22:05

Oleksandr

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