Number increment from string value

Question

I my application due to some reason I have two numbers in 5 digits.

The following code give you brief idea.

string s = "00001"; // Initially stored somewhere.
//Operation start
string id = DateTime.Now.ToString("yy") + DateTime.Now.AddYears(-1).ToString("yy") + s;
//Operation end

//Increment the value of s by 1. i.e 00001 to 00002

This can be done easily by convert the value of s to int and increment it by 1 but after all that I have to also store the incremented value of s in 5 digit so it will be "00002".

This think give me a pain...

Answer 1

use

string s = "00001";
int number = Convert.ToInt32(s);
number += 1;
string str = number.ToString("D5");

to get atleast 5 digits.

The "D" (or decimal) format specifier

If required, the number is padded with zeros to its left to produce the number of digits given by the precision specifier. If no precision specifier is specified, the default is the minimum value required to represent the integer without leading zeros.

Answer 2

This seems to work for me.

string s = "00001";
int i = Int32.Parse(s);
i++;
s = i.ToString("D" + s.Length);