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String.ToUpper Method (CultureInfo)

Updated: October 2008

Returns a copy of this String converted to uppercase, using the casing rules of the specified culture.

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

public string ToUpper(
	CultureInfo culture
)

Parameters

culture
Type: System.Globalization.CultureInfo

A CultureInfo object that supplies culture-specific casing rules.

Return Value

Type: System.String
A String in uppercase.

ExceptionCondition
ArgumentNullException

culture is null.

The casing rules of the culture specified by the culture parameter determine the way the case of a string is changed.

NoteNote:

   This method does not modify the value of the current instance. Instead, it returns a new string in which all characters in the current instance are uppercased.

The following example converts a string of lowercase characters to two strings of uppercase characters using the English-United States and Turkish-Turkey cultures, then compares the uppercase strings. The uppercase strings are identical except that for each occurrence of the Unicode LATIN CAPITAL LETTER I in one string, the other string contains LATIN CAPITAL LETTER I WITH DOT ABOVE.

using System;
using System.Globalization;

class Example 
{
    public static void Main() 
    {
       string str1 = "indigo";
       string str2, str3;

       // str2 is an uppercase copy of str1, using English-United States culture.
       str2 = str1.ToUpper(new CultureInfo("en-US", false));

       // str3 is an uppercase copy of str1, using Turkish-Turkey culture.
       str3 = str1.ToUpper(new CultureInfo("tr-TR", false));

       // Compare the code points and compare the uppercase strings.
       ShowCodePoints("str1", str1);
       ShowCodePoints("str2", str2);
       ShowCodePoints("str3", str3);
       Console.WriteLine("str2 is {0} to str3.", 
            String.CompareOrdinal(str2, str3) == 0 ? "equal" : "not equal");
    }

    public static void ShowCodePoints(string varName, string s)
    {
       Console.Write("{0} = {1}: ", varName, s);
       foreach (ushort u in s)
         Console.Write("{0:x4} ", u);
       Console.WriteLine();
    }
}
// This example displays the following output: 
//       str1 = indigo: 0069 006e 0064 0069 0067 006f 
//       str2 = INDIGO: 0049 004e 0044 0049 0047 004f 
//       str3 = INDIGO: 0130 004e 0044 0130 0047 004f 
//       str2 is not equal to str3.

Windows 7, Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP Starter Edition, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003, Windows Server 2000 SP4, Windows Millennium Edition, Windows 98, Windows CE, Windows Mobile for Smartphone, Windows Mobile for Pocket PC, Xbox 360, Zune

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

.NET Framework

Supported in: 3.5, 3.0, 2.0, 1.1, 1.0

.NET Compact Framework

Supported in: 3.5, 2.0, 1.0

XNA Framework

Supported in: 3.0, 2.0, 1.0

Date

History

Reason

October 2008

Added a note that the method returns a new String object.

Customer feedback.

August 2008

Removed remarks that applied only to the parameterless String.ToUpper() method.

Information enhancement.

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