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ToUpper Method (Char)
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Char.ToUpper Method (Char)

Converts the value of a Unicode character to its uppercase equivalent.

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

public static char ToUpper(
	char c
)

Parameters

c
Type: System.Char

The Unicode character to convert.

Return Value

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

Casing rules are obtained from the current culture.

Use String.ToUpper to convert a string to uppercase.

Notes to Callers

As explained in Best Practices for Using Strings in the .NET Framework, we recommend that you avoid calling character-casing and string-casing methods that substitute default values. Instead, you should call methods that require parameters to be explicitly specified. To convert a character to uppercase by using the casing conventions of the current culture, call the ToUpper(Char, CultureInfo) method overload with a value of CultureInfo.CurrentCulture for its culture parameter.

The following example converts each character in an array to its uppercase equivalent.

using System;

public class Example
{
   public static void Main()
   {
      char[] chars = { 'e', 'E', '6', ',', 'ж', 'ä' };
      foreach (var ch in chars)
          Console.WriteLine("{0} --> {1} {2}", ch, Char.ToUpper(ch),
                            ch == Char.ToUpper(ch) ? "(Same Character)" : "" );
   }
}
// The example displays the following output: 
//       e --> E 
//       E --> E (Same Character) 
//       6 --> 6 (Same Character) 
//       , --> , (Same Character) 
//       ? --> ? 
//       ä --> Ä

.NET Framework

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

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

XNA Framework

Supported in: 3.0, 2.0, 1.0

.NET for Windows Phone apps

Supported in: Windows Phone 8.1, Windows Phone Silverlight 8.1, Windows Phone Silverlight 8

Portable Class Library

Supported in: Portable Class Library
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