Char.ToUpper Method (Char, CultureInfo)

Converts the value of a specified Unicode character to its uppercase equivalent using specified culture-specific formatting information.

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

public static char ToUpper(
	char c,
	CultureInfo culture


Type: System.Char

The Unicode character to convert.

Type: System.Globalization.CultureInfo

An object that supplies culture-specific casing rules.

Return Value

Type: System.Char
The uppercase equivalent of c, modified according to culture, or the unchanged value of c if c is already uppercase, has no uppercase equivalent, or is not alphabetic.


culture is null.

Use String.ToUpper to convert a string to uppercase.

The following example converts each character in an array to its uppercase equivalent for the en-US culture, the invariant culture, and the tr-TR culture. In this example, the uppercase equivalent of each lowercase letter is identical for all cultures except for one case. The lowercase "i" character (U+0069) converts to "I" (U+0049) in the en-US and invariant cultures, but to "İ" (U+0130) in the tr-TR culture.

using System;
using System.Globalization;

public class Example
   public static void Main()
      CultureInfo[] cultures= { CultureInfo.CreateSpecificCulture("en-US"), 
                                CultureInfo.CreateSpecificCulture("tr-TR") };
      Char[] chars = {'ä', 'e', 'E', 'i', 'I' };

      Console.WriteLine("Character     en-US     Invariant     tr-TR");
      foreach (var ch in chars) {
         Console.Write("    {0}", ch);
         foreach (var culture in cultures) 
            Console.Write("{0,12}", Char.ToUpper(ch, culture));

// The example displays the following output: 
//       Character     en-US     Invariant     tr-TR 
//           ä           Ä           Ä           Ä 
//           e           E           E           E 
//           E           E           E           E 
//           i           I           I           İ 
//           I           I           I           I

.NET Framework

Supported in: 4.6, 4.5, 4, 3.5, 3.0, 2.0, 1.1, 1.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Portable Class Library

Supported in: Portable Class Library

Supported in: Windows Phone 8.1

Supported in: Windows Phone Silverlight 8.1

Supported in: Windows Phone Silverlight 8

Windows Phone 8.1, Windows Phone 8, Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

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