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

Converts the specified character to uppercase.

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

public virtual char ToUpper(
	char c


Type: System.Char
The character to convert to uppercase.

Return Value

Type: System.Char
The specified character converted to uppercase.

Casing semantics depend on the culture in use. For the invariant culture, the casing semantics are not culture-sensitive. For a specific culture, the casing semantics are sensitive to that culture.

If a security decision depends on a string comparison or a case-change operation, the application should use the InvariantCulture to ensure that the behavior is consistent regardless of the culture settings of the system. However, the invariant culture must be used only by processes that require culture-independent results, such as system services. Otherwise, it produces results that might be linguistically incorrect or culturally inappropriate.

For more information on cultures, see CultureInfo.

The following code example changes the casing of a string based on the en-US culture.

using System;
using System.Globalization;

public class Example
   public static void Demo(System.Windows.Controls.TextBlock outputBlock)
      // Defines the string with mixed casing.
      string myString = "wAr aNd pEaCe";

      // Creates a TextInfo based on the "en-US" culture.
      TextInfo myTI = new CultureInfo("en-US").TextInfo;

      // Changes a string to lowercase.
      outputBlock.Text += String.Format("\"{0}\" to lowercase: {1}", myString, myTI.ToLower(myString)) + "\n";

      // Changes a string to uppercase.
      outputBlock.Text += String.Format("\"{0}\" to uppercase: {1}", myString, myTI.ToUpper(myString)) + "\n";
This example produces the following output.
      "wAr aNd pEaCe" to lowercase: war and peace
      "wAr aNd pEaCe" to uppercase: WAR AND PEACE


Supported in: 5, 4, 3

Silverlight for Windows Phone

Supported in: Windows Phone OS 7.1, Windows Phone OS 7.0

XNA Framework

Supported in: Xbox 360, Windows Phone OS 7.0

For a list of the operating systems and browsers that are supported by Silverlight, see Supported Operating Systems and Browsers.

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