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Check If A String Value Is Numeric

, 7 Mar 2006 CPOL
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A way to determine if a string value has a specific Style Number And/OR Culture


This article will give you a way to determine if a given string has a valid number style (Integer, Float, Currency, etc.) according to specified/current culture.


In all VBScript and Visual Basic applications, there is a built-in function called IsNumeric / IsCurrency, but in C# there is no built-in function with the same functionality.
I have investigated a little and found out that all given solutions always use try catch to find out if the given string value can be parsed.

That seemed like a good way to test it, BUT what if the number contains commas or a currency sign?
Then I have to add another check to this code and strip down the non numeric sign and test the result.
Here I present a simple way that is supported by C#.

The Solution

In the code shown below, I actually use a built-in functionality of C# to determine if a given string value stands up to the requirements I want.

public bool isNumeric(string val, System.Globalization.NumberStyles NumberStyle)
    Double result;
    return Double.TryParse(val,NumberStyle,
		System.Globalization.CultureInfo.CurrentCulture,out result);

The above function allow me to test if the given string stands up to one or more of the following styles:

  • Hex Number
  • Number
  • Currency
  • Float

A more detailed list and explanation regarding System.Globalization.NumberStyles can be found here.


If you want to test for an integer number, then do the following:

isNumeric("42000", System.Globalization.NumberStyles.Integer)

If you want to test for an integer number separated with commas, then do the following:

isNumeric("42,000", System.Globalization.NumberStyles.Integer | 

Using Other Cultures

I use the current culture as shown in the code below.
A list of all available culture names can be obtained here.

public bool isNumeric
    (string val, System.Globalization.NumberStyles NumberStyle, string CultureName)
    Double result;
    return Double.TryParse(val,NumberStyle,new System.Globalization.CultureInfo
				(CultureName),out result);

There are many ways to approach this problem, I chose the one that suits beginner levels and does not involve any Regular Expression which requires a higher level of expertise.

If you are interested in a solution that involves Regular Expressions, please take a look at the following links:

Enjoy and tell me your findings.


  • 7th March, 2006: Initial post


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


About the Author

Leon Kovach
Web Developer
Israel Israel
No Biography provided

Comments and Discussions

GeneralMy vote of 5 PinprofessionalCanny Brisk1-Sep-13 21:45 
QuestionSimple VBScript program to Validate Numeric value PinmemberGauthamvit200310-Jul-11 8:46 
AnswerRe: Simple VBScript program to Validate Numeric value PinprofessionalCanny Brisk1-Sep-13 21:46 
GeneralRegEx for this function [modified] PinmemberAnthony Urwin8-Sep-10 1:24 
GeneralRe: RegEx for this function [modified] PinmemberMember 416585117-Apr-14 4:24 
QuestionDecimals? Pinmembersmcirish13-Jan-10 4:06 
AnswerRe: Decimals? PinprofessionalCanny Brisk1-Sep-13 21:47 
GeneralYes yes yes PinmemberL C D8-Dec-08 16:04 
GeneralRe: Yes yes yes PinmemberDush Abe26-Jun-13 13:03 
GeneralAnother way A one-liner too :) PinmemberHusko25-Mar-08 11:00 
Questionhow to check if string is int and return boolean Pinmembermax_dev2006@yahoo.com11-Oct-06 23:58 
AnswerRe: how to check if string is int and return boolean PinmemberGhecco17-Oct-06 6:31 
GeneralRe: how to check if string is int and return boolean Pinmembertfaiz20-Jun-11 23:29 
GeneralWorking for me PinmemberThisTrain7-Mar-06 6:29 
GeneralGood Thinking PinmemberThisTrain7-Mar-06 6:17 
GeneralNo, no, no Pinmembernorm.net7-Mar-06 5:35 
GeneralRe: No, no, no PinmemberMarc Brooks7-Mar-06 5:41 
GeneralRe: No, no, no Pinmembernorm.net7-Mar-06 9:49 
GeneralRe: No, no, no Pinmembernorm.net7-Mar-06 9:49 
GeneralRe: No, no, no Pinmemberkingbin7-Mar-06 6:54 
GeneralRe: No, no, no Pinmembernorm.net7-Mar-06 9:49 
GeneralRe: No, no, no Pinmembercerberiukas14-Mar-06 5:25 
AnswerRe: No, no, no PinmemberLeon Kovach18-Mar-06 23:57 
GeneralRe: No, no, no Pinmemberdave78638313-Aug-07 8:30 

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