c# chage string.format

Add zeroes before number

To add zeroes before a number, use colon separator „:“ and write as many zeroes as you want.

[C#]

String.Format("{0:00000}", 15);          // "00015"
String.Format("{0:00000}", -15);         // "-00015"

Align number to the right or left

To align number to the right, use comma „,“ followed by a number of characters. This alignment option must be before the colon separator.

[C#]

String.Format("{0,5}", 15);              // "   15"
String.Format("{0,-5}", 15);             // "15   "
String.Format("{0,5:000}", 15);          // "  015"
String.Format("{0,-5:000}", 15);         // "015  "

Different formatting for negative numbers and zero

You can have special format for negative numbers and zero. Use semicolon separator „;“ to separate formatting to two or three sections. The second section is format for negative numbers, the third section is for zero.

[C#]

String.Format("{0:#;minus #}", 15);      // "15"
String.Format("{0:#;minus #}", -15);     // "minus 15"
String.Format("{0:#;minus #;zero}", 0);  // "zero"

Custom number formatting (e.g. phone number)

Numbers can be formatted also to any custom format, e.g. like phone numbers or serial numbers.

[C#]

String.Format("{0:+### ### ### ###}", 447900123456); // "+447 900 123 456"
String.Format("{0:##-####-####}", 8958712551);       // "89-5871-2551"