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Posted 7 Jun 2012
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Format Number To Display

, 29 Jun 2012
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Format Number To Display


Number of time the end user / client require to display numeric data in different format. In this post I am going to discuss about the various type of the custom format that provided by to achieve requirement. Here I am going to discuss each format one by one

"0" Custom Specifier  

ToString("00000") - format put the leading 0 when number get display if digits in number less than the number of zero specified. when the below code is get executed output display 01234 because the number of digit less than the number of zero.

double value;
value = 1234;
Console.WriteLine("Format 1:  " + value.ToString("00000"));
ToString("00.00") - format do same thing as above replace zero if the number digit less , but the zero after decimal point allows to display digit equals number of zero after decimal if the number of digit less than display zero in place of that. output of the following code is 01.24 i.e only 2 digit allowed after decimal point. Note : - decimal point is display as per specified culture.
value = 1.235;
Console.WriteLine("Format 2:  " + value.ToString("00.00", 
ToString("0,0") - format cause to display comma between number. here when the following code is get executed , is get display after every three digit 1,234,567,890. Note : - in this comma get replace by the culture.
value = 1234567890;
Console.WriteLine("Format 3:  " + value.ToString("0,0",
ToString("0,0.0") - format is combination of above format.
value = 1234567890.123456;
Console.WriteLine("Format 4:  " + value.ToString("0,0.0", 

"#" Custom Specifier   

This specifier does same thing as "0" specifier do but the basic difference is it doesn't anything if the number is no equal to # where as "0" specifier replace 0 if digit not exists.

ToString("#####") or ToString("#") - format allow to replace each digit by #, output of below code execution is 9867752985 which is differ from "0" specifier.

value = 9867752985;
Below code does same as above but format number by replace each # by each digit. so the output of the code is 98-67-75.
value = 986775;
Below code execution again format number and output display it as (986) 77-52985
value = 9867752985;
Console.WriteLine(value.ToString("(###) ###-####"));


"." Custom Specifier

This specifier is already discuss with the "0" specifier this useful to display numeric number if the digit is not present than 0 get display on that place i.e at the start or end. so the output of below code is "01.20" and if I set value = 12 than the output is "12.00". But here I set culture info so that output is "01,20" so "." get replace by ",".


"%" Custom Specifier 

Format cause the number to display with "%" and multiply number with 100. so if the number is 0.86 after applying % specifier it get display as "8.6%" if the number is 86 than output will be "8600%". Below code execution does the same thing  

value = .086;
Console.WriteLine(value.ToString("#0.##%", CultureInfo.InvariantCulture));

value = .869;
Console.WriteLine(value.ToString("00.##%", CultureInfo.InvariantCulture));

value = 86;
Console.WriteLine(value.ToString("#0.##%", CultureInfo.InvariantCulture));


"‰" Custom Specifier

per mille character (‰ or \u2030) format multiply the number by 1000. So the output of below code execution is 3.54‰ . But I don't think this format is useful somewhere.

value = .00354;
string perMilleFmt = "#0.## " + '\u2030';
Console.WriteLine(value.ToString(perMilleFmt, CultureInfo.InvariantCulture));

"E" and "e" Custom Specifiers

This cause number to be display in scientific notation format with the "E or e" symbol.  

value = 86000;
Console.WriteLine(value.ToString("0.###E+0", CultureInfo.InvariantCulture));

Console.WriteLine(value.ToString("0.###E+000", CultureInfo.InvariantCulture));

value = -80;
Console.WriteLine(value.ToString("0.###E-000", CultureInfo.InvariantCulture));


";" Section Separator

This allow to display number according to number sign. As you can see in below code the fmt variable which is format I am going to apply on my number here first format before ; is for positive number , second format is for negative number and last format is for the zero value. Basically its "Positive;negative;zero" format. You can see the what it does in output of this code.

double posValue = 1234;
double negValue = -1234; 
double zeroValue = 0;

string fmt = "+##;-##;**Zero**";

Console.WriteLine("value is positive : " + posValue.ToString(fmt));    

Console.WriteLine("value is negative : " +negValue.ToString(fmt));    

Console.WriteLine("value is Zero : " + zeroValue.ToString(fmt));



So above article talks about how easily you can change your numeric values to display to end client of the application with ToString() method and different format available with it.

Source : 


This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)


About the Author

Pranay Rana
Software Developer (Senior) GMind Solusion
India India

Microsoft C# MVP (12-13)

Hey, I am Pranay Rana, working as a ITA in MNC. Web development in Asp.Net with C# and MS sql server are the experience tools that I have had for the past 5.5 years now.

For me def. of programming is : Programming is something that you do once and that get used by multiple for many years

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Comments and Discussions

Questionhow convert numeric value like 1234567890.12 To 12,34,56,78,90:12 ? Pin
DalachhaSolanki1-Jul-15 19:23
memberDalachhaSolanki1-Jul-15 19:23 
GeneralMy vote of 3 Pin
AlluvialDeposit28-May-13 0:04
professionalAlluvialDeposit28-May-13 0:04 
GeneralMy vote of 5 Pin
Renju Vinod22-May-13 1:57
professionalRenju Vinod22-May-13 1:57 
GeneralMy vote of 5 Pin
Member6122-May-13 0:17
memberMember6122-May-13 0:17 
GeneralMy vote of 1 Pin
Member 507709213-Dec-12 21:16
memberMember 507709213-Dec-12 21:16 
GeneralMY Vote Pin
onurag192-Jul-12 17:47
memberonurag192-Jul-12 17:47 
GeneralMy vote of 4 Pin
mbsmbs1-Jul-12 21:22
membermbsmbs1-Jul-12 21:22 
GeneralMy vote of 5 Pin
Anurag Gandhi1-Jul-12 6:54
memberAnurag Gandhi1-Jul-12 6:54 
GeneralMy vote of 1 Pin
Klaus Luedenscheidt29-Jun-12 18:03
memberKlaus Luedenscheidt29-Jun-12 18:03 
GeneralRe: My vote of 1 Pin
Pranay Rana29-Jun-12 21:20
memberPranay Rana29-Jun-12 21:20 
GeneralMy vote of 4 Pin
Forogar26-Jun-12 11:24
memberForogar26-Jun-12 11:24 
Questionok Pin
CIDev26-Jun-12 8:39
memberCIDev26-Jun-12 8:39 
GeneralMy vote of 5 Pin
_ Kunal Chowdhury _13-Jun-12 18:42
mvp_ Kunal Chowdhury _13-Jun-12 18:42 
GeneralRe: My vote of 5 Pin
Pranay Rana14-Jun-12 9:06
memberPranay Rana14-Jun-12 9:06 
GeneralMy vote of 1 Pin
tlhintoq13-Jun-12 3:09
membertlhintoq13-Jun-12 3:09 
GeneralRe: My vote of 1 Pin
Pranay Rana13-Jun-12 18:31
memberPranay Rana13-Jun-12 18:31 
QuestionNothing original Pin
tlhintoq13-Jun-12 3:08
membertlhintoq13-Jun-12 3:08 

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