CODEWITHSUNDEEP
c#
JudyJ
JudyJ

Reputation: 597

How can I format an integer variable so it becomes a leading zero string

Need some help with C#.

I have a variable i that has numbers from 1 to 20. I would like to convert this variable so it displays 01,02 etc as a string and then have it increment. I tried to do this with the following but it didn't work. 

i++.ToString('D2')

Any ideas would be much appreciated

Judy

Upvotes: 2

Views: 1637

Answers (4)

Stefano Driussi
Stefano Driussi

Reputation: 2261

Try also this:

i++.ToString().PadLeft(2, '0');

Upvotes: 0

e36M3
e36M3

Reputation: 6022

i++.ToString().PadLeft(2, "0");

Upvotes: 0

Dan Tao
Dan Tao

Reputation: 128317

Try this:

i++.ToString("00")

Update: Actually, the solution you tried should also work just fine. You just need to enclose "D2" in double quotes rather than single quotes (single quotes are used to denote char values in C# rather than strings):

i++.ToString("D2") // note: "D2", not 'D2'

Upvotes: 6

Daren Thomas
Daren Thomas

Reputation: 70314

try this:

string.Format("{0:00}", i++);

Also, be sure to read SteveX on string formatting in C#. That site really nails it, giving you all the information you could ever want on string formatting in .NET.

It seems you can also pass the format string to the ToString method:

i++.ToString("00");

This is slightly less generic as you can't format multiple variables to one string, but if you only need to format that one integer, it will do the trick.

Upvotes: 5

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