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IsLetter Method (Char)
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Char.IsLetter Method (Char)

Indicates whether the specified Unicode character is categorized as an alphabetic letter.

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

'Declaration
Public Shared Function IsLetter ( _
	c As Char _
) As Boolean
'Usage
Dim c As Char
Dim returnValue As Boolean

returnValue = Char.IsLetter(c)
public static boolean IsLetter (
	char c
)
public static function IsLetter (
	c : char
) : boolean

Parameters

c

A Unicode character.

Return Value

true if c is an alphabetic letter; otherwise, false.

Valid letters are members of the following categories in UnicodeCategory: UppercaseLetter, LowercaseLetter, TitlecaseLetter, ModifierLetter, and OtherLetter.

The following code example demonstrates IsLetter.

Imports System

Module IsLetterSample

    Sub Main()

        Dim ch8 As Char
        ch8 = "8"c

        Console.WriteLine(Char.IsLetter(ch8))                   ' Output: "False"
        Console.WriteLine(Char.IsLetter("sample string", 5))    ' Output: "True"

    End Sub

End Module

import System.*;

public class IsLetterSample
{
    public static void main(String[] args)
    {
        char ch = '8';
      
        Console.WriteLine(Char.IsLetter(ch));                    // False
        Console.WriteLine(Char.IsLetter("sample string", 7));    // True
    } //main
} //IsLetterSample

Windows 98, Windows 2000 SP4, Windows CE, Windows Millennium Edition, Windows Mobile for Pocket PC, Windows Mobile for Smartphone, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

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

.NET Framework

Supported in: 2.0, 1.1, 1.0

.NET Compact Framework

Supported in: 2.0, 1.0

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