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Showing content from https://learn.microsoft.com/en-us/dotnet/api/system.char.islower below:

Char.IsLower Method (System) | Microsoft Learn

Char.IsLower Method Definition

Indicates whether a Unicode character is categorized as a lowercase letter.

Overloads IsLower(Char)

Indicates whether the specified Unicode character is categorized as a lowercase letter.

IsLower(String, Int32)

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

Examples

The following code example demonstrates IsLower.

using System;

public class IsLowerSample {
    public static void Main() {
        char ch = 'a';

        Console.WriteLine(Char.IsLower(ch));				// Output: "True"
        Console.WriteLine(Char.IsLower("upperCase", 5));	// Output: "False"
    }
}

open System

let ch = 'a'

printfn $"{Char.IsLower ch}"                    // Output: "True"
printfn $"""{Char.IsLower("upperCase", 5)}"""   // Output: "False"

Module IsLowerSample

    Sub Main()

        Dim ch As Char
        ch = "a"c

        Console.WriteLine(Char.IsLower(ch))                 ' Output: "True"
        Console.WriteLine(Char.IsLower("upperCase", 5))     ' Output: "False"

    End Sub

End Module

IsLower(Char)

Source:: Char.cs

Source:: Char.cs

Source:: Char.cs

Source:: Char.cs

Indicates whether the specified Unicode character is categorized as a lowercase letter.

public:
 static bool IsLower(char c);

public static bool IsLower(char c);

static member IsLower : char -> bool

Public Shared Function IsLower (c As Char) As Boolean

Parameters

c: Char

The Unicode character to evaluate.

Returns

true if c is a lowercase letter; otherwise, false.

Remarks

Valid lowercase letters are members of the following category in UnicodeCategory: LowercaseLetter.

See also

IsLower(String, Int32)

Source:: Char.cs

Source:: Char.cs

Source:: Char.cs

Source:: Char.cs

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

public:
 static bool IsLower(System::String ^ s, int index);

public static bool IsLower(string s, int index);

static member IsLower : string * int -> bool

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

Parameters

index: Int32

The position of the character to evaluate in s.

Returns

true if the character at position index in s is a lowercase letter; otherwise, false.

Exceptions

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 lowercase letters are members of the following category in UnicodeCategory: LowercaseLetter.