Format string to a 3 digit number

Question

Instead of doing this  I want to make use of string format   to accomplish the same result   if  myString Length  lt  3        myString     00    3

User · Answer

This is how it s done using string interpolation C  7     myString 000

User · Answer

This is a short hand string format Interpolation      value D3

User · Answer

You can also do   string Format   0 D3   3

User · Answer

How to  Pad a Number with Leading Zeros  http   msdn microsoft com en-us library dd260048 aspx

User · Answer

Can t comment yet with enough reputation   let me add a sidenote   Just in case your output need to be fixed length of 3-digit   i e  for number run up to 1000 or more  reserved fixed length   don t forget to add  mod 1000 on it    yourNumber 1001  yourString  yourNumber ToString  D3               1001   yourString   yourNumber 1000  ToString  D3        001  truncated to 3-digit as expected   Trail sample on Fiddler https   dotnetfiddle net qLrePt

User · Answer

string Format   0 000    myString

User · Answer

If you re just formatting a number  you can just provide the proper custom numeric format to make it a 3 digit string directly   myString   3 ToString  000      Or  alternatively  use the standard D format string   myString   3 ToString  D3

User · Answer

It s called Padding   myString PadLeft 3   0

User · Answer

Does it have to be String Format   This looks like a job for String Padleft  myString myString PadLeft 3   0      Or  if you are converting direct from an int   myInt toString  D3

[c#] Format string to a 3 digit number

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