Char.IsUpper Method (String, Int32) (System)

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.NET Framework Class Library

Char.IsUpper Method (String, Int32)

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

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

Syntax

Visual Basic

Public Shared Function IsUpper ( _
	s As String, _
	index As Integer _
) As Boolean

public static bool IsUpper(
	string s,
	int index
)

Visual C++

public:
static bool IsUpper(
	String^ s, 
	int index
)

static member IsUpper : 
        s:string * 
        index:int -> bool

Parameters

s: Type: System.String
A string.

index: Type: System.Int32
The position of the character to evaluate in s.

Return Value

Type: System.Boolean
true if the character at position index in s is an uppercase letter; otherwise, false.

Exceptions

Exception	Condition
ArgumentNullException	s is null.
ArgumentOutOfRangeException	index is less than zero or greater than the last position in s.

Remarks

Character positions in a string are indexed starting from zero.

Valid uppercase letters are members of the following category in UnicodeCategory: UppercaseLetter.

Version Information

.NET Framework

Supported in: 4, 3.5, 3.0, 2.0, 1.1, 1.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Portable Class Library

Supported in: Portable Class Library

Platforms

Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

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

Reference

Char Structure

IsUpper Overload

System Namespace

Boolean

String