How can I format a number into a string with leading zeros

Question

I have a number that I need to convert to a string  First I used this   Key   i ToString      But I realize it s being sorted in a strange order and so I need to pad it with zeros  How could I do this

User · Answer

Here I want my no to limit in 4 digit like if it is 1 it should show as 0001,if it 11 it should show as 0011..Below are the code.

        reciptno=1;//Pass only integer.

        string formatted = string.Format("{0:0000}", reciptno);

        TxtRecNo.Text = formatted;//Output=0001..

I implemented this code to generate Money receipt no.

User · Answer

If you like to keep it fixed width  for example 10 digits  do it like this  Key   i ToString  0000000000      Replace with as many digits as you like   i   123 will then result in Key    0000000123

User · Answer

Try   Key   i ToString  000000      Personally  though  I d see if you can t sort on the integer directly  rather than the string representation

User · Answer

For interpolated strings      Int value   someInt D4  or  someInt 0000   Float   someFloat  00 00

User · Answer

use   i ToString  D10     See Int32 ToString  MSDN   and Standard Numeric Format Strings  MSDN    Or use String PadLeft  For example   int i   321  Key   i ToString   PadLeft 10   0      Would result in 0000000321   Though String PadLeft would not work for negative numbers   See String PadLeft  MSDN

User · Answer

int num 1  string number num ToString   PadLeft 4   0     Output  00001   EDIT  Changed to match the PadLeft amount

User · Answer

Rather simple   Key   i ToString  D2      D stands for  decimal number   2 for the number of digits to print

User · Answer

Since nobody has yet mentioned this  if you are using C  version 6 or above  i e  Visual Studio 2015  then you can use string interpolation to simplify your code  So instead of using string Format       you can just do this   Key      i D2

User · Answer

Usually String Format  format   object  is preferable to object ToString  format    Therefore    String Format   0 00000    15       is preferable to   Key   i ToString  000000

User · Answer

See String formatting in C  for some example uses of String Format  Actually a better example of formatting int  String Format   0 00000    15                00015    or use String Interpolation      15 00000                                  00015

[c#] How can I format a number into a string with leading zeros?

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