ToUpper Method (CultureInfo)
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String.ToUpper Method (CultureInfo)

[ This article is for Windows Phone 8 developers. If you’re developing for Windows 10, see the latest documentation. ]

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 Function ToUpper ( _
	culture As CultureInfo _
) As String


Type: System.Globalization.CultureInfo
An object that supplies culture-specific casing rules.

Return Value

Type: System.String
The uppercase equivalent of the current string.


culture is Nothing.

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


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 code 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.

' Sample for String.ToUpper(CultureInfo)
Imports System.Globalization

Class Example

   Public Shared Sub Demo(ByVal outputBlock As System.Windows.Controls.TextBlock)
      Dim str1 As [String] = "indigo"
      Dim str2, str3 As [String]

      outputBlock.Text &= vbCrLf
      outputBlock.Text &= String.Format("str1 = '{0}'", str1) & vbCrLf

      outputBlock.Text &= "str2 = Upper case copy of str1 using English-United States culture." & vbCrLf
      ' str2 is an upper case copy of str1, using English-United States culture.
      str2 = str1.ToUpper(New CultureInfo("en-US"))

      ' str3 is an upper case copy of str1, using Turkish-Turkey culture.
      outputBlock.Text &= "str3 = Upper case copy of str1 using Turkish-Turkey culture." & vbCrLf
      str3 = str1.ToUpper(New CultureInfo("tr-TR"))

      ' Compare the code points in str2 and str3.
      outputBlock.Text &= vbCrLf
      outputBlock.Text &= String.Format("str2 is {0} to str3.", IIf(0 = [String].CompareOrdinal(str2, str3), "equal", "not equal")) & vbCrLf
      CodePoints(outputBlock, "str1", str1)
      CodePoints(outputBlock, "str2", str2)
      CodePoints(outputBlock, "str3", str3)
   End Sub 'Main

   Public Shared Sub CodePoints(ByVal outputBlock As System.Windows.Controls.TextBlock, ByVal title As [String], ByVal s As [String])
      outputBlock.Text &= String.Format("{0}The code points in {1} are: {0}", vbCrLf, title)
      Dim c As Char
      For Each c In s
         outputBlock.Text &= String.Format("{0:x4} ", AscW(c))
      Next c
      outputBlock.Text &= vbCrLf
   End Sub 'CodePoints
End Class 'Sample
'This example produces the following results:
'str1 = 'indigo'
'str2 = Upper case copy of str1 using English-United States culture.
'str3 = Upper case copy of str1 using Turkish-Turkey culture.
'str2 is not equal to str3.
'The code points in str1 are:
'0069 006e 0064 0069 0067 006f
'The code points in str2 are:
'0049 004e 0044 0049 0047 004f
'The code points in str3 are:
'0130 004e 0044 0130 0047 004f

Windows Phone OS

Supported in: 8.1, 8.0, 7.1, 7.0

Windows Phone

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