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TextInfo.ToUpper Method (Char)

Converts the specified character to uppercase.

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

'Declaration
Public Overridable Function ToUpper ( _
	c As Char _
) As Char

Parameters

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 English (United States) culture, with the culture name en-US.

Imports System
Imports System.Globalization

Public Class SamplesTextInfo

   Public Shared Sub Main()

      ' Defines the string with mixed casing. 
      Dim myString As String = "wAr aNd pEaCe" 

      ' Creates a TextInfo based on the "en-US" culture. 
      Dim myTI As TextInfo = New CultureInfo("en-US", False).TextInfo

      ' Changes a string to lowercase.
      Console.WriteLine("""{0}"" to lowercase: {1}", myString, myTI.ToLower(myString))

      ' Changes a string to uppercase.
      Console.WriteLine("""{0}"" to uppercase: {1}", myString, myTI.ToUpper(myString))

      ' Changes a string to titlecase.
      Console.WriteLine("""{0}"" to titlecase: {1}", myString, myTI.ToTitleCase(myString))

   End Sub 'Main 

End Class 'SamplesTextInfo


'This code produces the following output. 

'"wAr aNd pEaCe" to lowercase: war and peace 
'"wAr aNd pEaCe" to uppercase: WAR AND PEACE 
'"wAr aNd pEaCe" to titlecase: War And Peace

.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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