ToString Method (String, IFormatProvider)
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Int32.ToString Method (String, IFormatProvider)

[ This article is for Windows Phone 8 developers. If you’re developing for Windows 10, see the latest documentation. ]

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 (see Remarks).
Type: System.IFormatProvider
An IFormatProvider 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.


IFormattable.ToString(String, IFormatProvider)


format is invalid or not supported.

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 = {new CultureInfo("en-US"), 
                          new CultureInfo("fr-FR"), 
                          new CultureInfo("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.
      outputBlock.Text += String.Format("{0} format using {1} culture: {2, 16} {3, 16}",
                        specifier, culture.Name,
                        positiveNumber.ToString(specifier, culture),
                        negativeNumber.ToString(specifier, culture)) + "\n";
   outputBlock.Text += "\n";
// 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

Windows Phone OS

Supported in: 8.1, 8.0, 7.1, 7.0

Windows Phone

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