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Char.IsLetter Method (String, Int32)

Indicates whether the character at the specified position in a specified string is categorized as an alphabetic character.

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

public static bool IsLetter (
	string s,
	int index
)
public static boolean IsLetter (
	String s, 
	int index
)
public static function IsLetter (
	s : String, 
	index : int
) : boolean

Parameters

s

A string.

index

The character position in s.

Return Value

true if the character at position index in s is an alphabetic character; otherwise, false.
Exception typeCondition

ArgumentNullException

s is a null reference (Nothing in Visual Basic).

ArgumentOutOfRangeException

index is less than zero or greater than the last position in s.

Character positions in a string are indexed starting from zero.

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

The following code example demonstrates IsLetter.

using System;

public class IsLetterSample {
	public static void Main() {
		char ch = '8';

		Console.WriteLine(Char.IsLetter(ch));					// False
		Console.WriteLine(Char.IsLetter("sample string", 7));	// True
	}
}

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
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