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String.ToUpper Method

Returns a copy of this string converted to uppercase, using the casing rules of the current culture.

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

'Declaration
Public Function ToUpper As String

Return Value

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

Starting in Silverlight 4, the behavior of the String.ToUpper method has changed. In Silverlight 4, it converts the current string instance to uppercase using the casing rules of the current culture. This conforms to the behavior of the String.ToUpper method in the full .NET Framework. In Silverlight 2 and Silverlight 3, it uses the casing rules of the invariant culture.

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 calls the ToUpper method to convert a series of one-character strings that contain each character in the Basic Latin, Latin-1 Supplement, and Latin Extended-A character sets. It then displays each string whose uppercase character is different from its lowercase character.


Module Example
   Public Sub Demo(ByVal outputBlock As System.Windows.Controls.TextBlock)
      Dim n As Integer = 0
      For ctr As Integer = &H20 To &H17F
         Dim string1 As String = ChrW(ctr).ToString()
         Dim upperString As String = string1.ToUpper()
         If string1 <> upperString Then
            outputBlock.Text += String.Format("{0} (\u+{1}) --> {2} (\u+{3})         ", _
                          string1, _
                          Convert.ToUInt16(string1.Chars(0)).ToString("X4"), _
                          upperString, _
                          Convert.ToUInt16(upperString.Chars(0)).ToString("X4"))
            n += 1
            If n Mod 2 = 0 Then outputBlock.Text &= vbCrLf
         End If
      Next
   End Sub
End Module
' The example displays the following output:
'    a (\u+0061) --> A (\u+0041)         b (\u+0062) --> B (\u+0042)
'    c (\u+0063) --> C (\u+0043)         d (\u+0064) --> D (\u+0044)
'    e (\u+0065) --> E (\u+0045)         f (\u+0066) --> F (\u+0046)
'    g (\u+0067) --> G (\u+0047)         h (\u+0068) --> H (\u+0048)
'    i (\u+0069) --> I (\u+0049)         j (\u+006A) --> J (\u+004A)
'    k (\u+006B) --> K (\u+004B)         l (\u+006C) --> L (\u+004C)
'    m (\u+006D) --> M (\u+004D)         n (\u+006E) --> N (\u+004E)
'    o (\u+006F) --> O (\u+004F)         p (\u+0070) --> P (\u+0050)
'    q (\u+0071) --> Q (\u+0051)         r (\u+0072) --> R (\u+0052)
'    s (\u+0073) --> S (\u+0053)         t (\u+0074) --> T (\u+0054)
'    u (\u+0075) --> U (\u+0055)         v (\u+0076) --> V (\u+0056)
'    w (\u+0077) --> W (\u+0057)         x (\u+0078) --> X (\u+0058)
'    y (\u+0079) --> Y (\u+0059)         z (\u+007A) --> Z (\u+005A)
'    à (\u+00E0) --> À (\u+00C0)         á (\u+00E1) --> Á (\u+00C1)
'    â (\u+00E2) --> Â (\u+00C2)         ã (\u+00E3) --> Ã (\u+00C3)
'    ä (\u+00E4) --> Ä (\u+00C4)         å (\u+00E5) --> Å (\u+00C5)
'    æ (\u+00E6) --> Æ (\u+00C6)         ç (\u+00E7) --> Ç (\u+00C7)
'    è (\u+00E8) --> È (\u+00C8)         é (\u+00E9) --> É (\u+00C9)
'    ê (\u+00EA) --> Ê (\u+00CA)         ë (\u+00EB) --> Ë (\u+00CB)
'    ì (\u+00EC) --> Ì (\u+00CC)         í (\u+00ED) --> Í (\u+00CD)
'    î (\u+00EE) --> Î (\u+00CE)         ï (\u+00EF) --> Ï (\u+00CF)
'    ð (\u+00F0) --> Ð (\u+00D0)         ñ (\u+00F1) --> Ñ (\u+00D1)
'    ò (\u+00F2) --> Ò (\u+00D2)         ó (\u+00F3) --> Ó (\u+00D3)
'    ô (\u+00F4) --> Ô (\u+00D4)         õ (\u+00F5) --> Õ (\u+00D5)
'    ö (\u+00F6) --> Ö (\u+00D6)         ø (\u+00F8) --> Ø (\u+00D8)
'    ù (\u+00F9) --> Ù (\u+00D9)         ú (\u+00FA) --> Ú (\u+00DA)
'    û (\u+00FB) --> Û (\u+00DB)         ü (\u+00FC) --> Ü (\u+00DC)
'    ý (\u+00FD) --> Ý (\u+00DD)         þ (\u+00FE) --> Þ (\u+00DE)
'    ÿ (\u+00FF) --> Ÿ (\u+0178)         ā (\u+0101) --> Ā (\u+0100)
'    ă (\u+0103) --> Ă (\u+0102)         ą (\u+0105) --> Ą (\u+0104)
'    ć (\u+0107) --> Ć (\u+0106)         ĉ (\u+0109) --> Ĉ (\u+0108)
'    ċ (\u+010B) --> Ċ (\u+010A)         č (\u+010D) --> Č (\u+010C)
'    ď (\u+010F) --> Ď (\u+010E)         đ (\u+0111) --> Đ (\u+0110)
'    ē (\u+0113) --> Ē (\u+0112)         ĕ (\u+0115) --> Ĕ (\u+0114)
'    ė (\u+0117) --> Ė (\u+0116)         ę (\u+0119) --> Ę (\u+0118)
'    ě (\u+011B) --> Ě (\u+011A)         ĝ (\u+011D) --> Ĝ (\u+011C)
'    ğ (\u+011F) --> Ğ (\u+011E)         ġ (\u+0121) --> Ġ (\u+0120)
'    ģ (\u+0123) --> Ģ (\u+0122)         ĥ (\u+0125) --> Ĥ (\u+0124)
'    ħ (\u+0127) --> Ħ (\u+0126)         ĩ (\u+0129) --> Ĩ (\u+0128)
'    ī (\u+012B) --> Ī (\u+012A)         ĭ (\u+012D) --> Ĭ (\u+012C)
'    į (\u+012F) --> Į (\u+012E)         ı (\u+0131) --> I (\u+0049)
'    ij (\u+0133) --> IJ (\u+0132)         ĵ (\u+0135) --> Ĵ (\u+0134)
'    ķ (\u+0137) --> Ķ (\u+0136)         ĺ (\u+013A) --> Ĺ (\u+0139)
'    ļ (\u+013C) --> Ļ (\u+013B)         ľ (\u+013E) --> Ľ (\u+013D)
'    ŀ (\u+0140) --> Ŀ (\u+013F)         ł (\u+0142) --> Ł (\u+0141)
'    ń (\u+0144) --> Ń (\u+0143)         ņ (\u+0146) --> Ņ (\u+0145)
'    ň (\u+0148) --> Ň (\u+0147)         ŋ (\u+014B) --> Ŋ (\u+014A)
'    ō (\u+014D) --> Ō (\u+014C)         ŏ (\u+014F) --> Ŏ (\u+014E)
'    ő (\u+0151) --> Ő (\u+0150)         œ (\u+0153) --> Œ (\u+0152)
'    ŕ (\u+0155) --> Ŕ (\u+0154)         ŗ (\u+0157) --> Ŗ (\u+0156)
'    ř (\u+0159) --> Ř (\u+0158)         ś (\u+015B) --> Ś (\u+015A)
'    ŝ (\u+015D) --> Ŝ (\u+015C)         ş (\u+015F) --> Ş (\u+015E)
'    š (\u+0161) --> Š (\u+0160)         ţ (\u+0163) --> Ţ (\u+0162)
'    ť (\u+0165) --> Ť (\u+0164)         ŧ (\u+0167) --> Ŧ (\u+0166)
'    ũ (\u+0169) --> Ũ (\u+0168)         ū (\u+016B) --> Ū (\u+016A)
'    ŭ (\u+016D) --> Ŭ (\u+016C)         ů (\u+016F) --> Ů (\u+016E)
'    ű (\u+0171) --> Ű (\u+0170)         ų (\u+0173) --> Ų (\u+0172)
'    ŵ (\u+0175) --> Ŵ (\u+0174)         ŷ (\u+0177) --> Ŷ (\u+0176)
'    ź (\u+017A) --> Ź (\u+0179)         ż (\u+017C) --> Ż (\u+017B)
'    ž (\u+017E) --> Ž (\u+017D)


Silverlight

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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