Int32.ToString Method (String, IFormatProvider)


The .NET API Reference documentation has a new home. Visit the .NET API Browser on to see the new experience.

Converts the numeric value of this instance to its equivalent string representation using the specified format and culture-specific format information.

Namespace:   System
Assembly:  mscorlib (in mscorlib.dll)

public string ToString(
	string format,
	IFormatProvider provider


Type: System.String

A standard or custom numeric format string.

Type: System.IFormatProvider

An object that supplies culture-specific formatting information.

Return Value

Type: System.String

The string representation of the value of this instance as specified by format and provider.

Exception Condition

format is invalid or not supported.

The ToString(String, IFormatProvider) method formats an Int32 value in a specified format by using the NumberFormatInfo object of a specified culture. If you want to use default format or culture settings, use the other overloads of the ToString method, as follows:

To use format

For culture

Use the overload

Default ("G") format

Default (current) culture


Default ("G") format

A specific culture


A specific format

Default (current) culture


The format parameter can be either a standard or a custom numeric format string. All standard numeric format strings other than "R" (or "r") are supported, as are all custom numeric format characters. If format is null or an empty string (""), the return value for this instance is formatted with the general numeric format specifier ("G").

The provider parameter is an object that implements the IFormatProvider interface. Its GetFormat method returns a NumberFormatInfo object that provides culture-specific format information about the format of the string that is returned by this method. The object that implements IFormatProvider can be any of the following:

If provider is null or a NumberFormatInfo object cannot be obtained from provider, the return value for this instance is formatted with the NumberFormatInfo for the current culture.

The .NET Framework provides extensive formatting support, which is described in greater detail in the following formatting topics:

The following example displays a positive and a negative value using each of the supported standard numeric format specifiers for three different cultures.

// Define cultures whose formatting conventions are to be used.
CultureInfo[] cultures = {CultureInfo.CreateSpecificCulture("en-US"), 
                          CultureInfo.CreateSpecificCulture("es-ES") };
int positiveNumber = 1679;
int negativeNumber = -3045;
string[] specifiers = {"G", "C", "D8", "E2", "F", "N", "P", "X8"}; 

foreach (string specifier in specifiers)
   foreach (CultureInfo culture in cultures)
      // Display values with "G" format specifier.
      Console.WriteLine("{0} format using {1} culture: {2, 16} {3, 16}",  
                        specifier, culture.Name, 
                        positiveNumber.ToString(specifier, culture), 
                        negativeNumber.ToString(specifier, culture));
// The example displays the following output:
//       G format using en-US culture:             1679            -3045
//       G format using fr-FR culture:             1679            -3045
//       G format using es-ES culture:             1679            -3045
//       C format using en-US culture:        $1,679.00      ($3,045.00)
//       C format using fr-FR culture:       1 679,00 €      -3 045,00 €
//       C format using es-ES culture:       1.679,00 €      -3.045,00 €
//       D8 format using en-US culture:         00001679        -00003045
//       D8 format using fr-FR culture:         00001679        -00003045
//       D8 format using es-ES culture:         00001679        -00003045
//       E2 format using en-US culture:        1.68E+003       -3.05E+003
//       E2 format using fr-FR culture:        1,68E+003       -3,05E+003
//       E2 format using es-ES culture:        1,68E+003       -3,05E+003
//       F format using en-US culture:          1679.00         -3045.00
//       F format using fr-FR culture:          1679,00         -3045,00
//       F format using es-ES culture:          1679,00         -3045,00
//       N format using en-US culture:         1,679.00        -3,045.00
//       N format using fr-FR culture:         1 679,00        -3 045,00
//       N format using es-ES culture:         1.679,00        -3.045,00
//       P format using en-US culture:     167,900.00 %    -304,500.00 %
//       P format using fr-FR culture:     167 900,00 %    -304 500,00 %
//       P format using es-ES culture:     167.900,00 %    -304.500,00 %
//       X8 format using en-US culture:         0000068F         FFFFF41B
//       X8 format using fr-FR culture:         0000068F         FFFFF41B
//       X8 format using es-ES culture:         0000068F         FFFFF41B

Universal Windows Platform
Available since 8
.NET Framework
Available since 1.1
Portable Class Library
Supported in: portable .NET platforms
Available since 2.0
Windows Phone Silverlight
Available since 7.0
Windows Phone
Available since 8.1
Return to top