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C# | Char.IsLower() Method - GeeksforGeeks

Last Updated : 11 Jul, 2025

In C#,

is a

struct method which is used to check whether a Unicode character can be categorized as a lowercase letter or not. Valid lowercase letters will be the members of

. This method can be overloaded by passing different type and number of arguments to it.

This method is used to check whether the specified Unicode character matches lowercase letter or not. If it matches then it returns True otherwise return False.

public static bool IsLower(char ch);

ch: It is required Unicode character of System.char type which is to be checked.

The method returns True, if it successfully matches any lowercase letter, otherwise returns False. The return type of this method is

.

// C# program to illustrate the
// Char.IsLower(Char) Method
using System;

class GFG {

    // Main Method
    static public void Main()
    {

        // Declaration of data type
        bool result;

        // checking if g is a
        // lowercase letter or not
        char ch1 = 'g';
        result = Char.IsLower(ch1);
        Console.WriteLine(result);

        // checking if 'G' is a
        // lowercase letter or not
        char ch2 = 'G';
        result = Char.IsLower(ch2);
        Console.WriteLine(result);
    }
}

This method is used to check whether the specified string at specified position matches with any lowercase letter or not. If it matches then it returns True otherwise returns False.

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

Str: It is the required string of System.String type which is to be evaluate. index: It is the position of character in string to be compared and type of this parameter is System.Int32.

The method returns True if it successfully matches any lowercase letter at the specified index in the specified string, otherwise returns False. The return type of this method is

.

• If the value of str is null then this method will give ArgumentNullException
• If the index is less than zero or greater than the last position in str then this method will give ArgumentOutOfRangeException.

// C# program to illustrate the
// Char.IsLower(String, Int32) Method
using System;

class GFG {

    // Main Method
    static public void Main()
    {

        // Declaration of data type
        bool result;

        // checking for lowercase letter in
        // a string at a desired position
        string str1 = "GeeksforGeeks";
        result = Char.IsLower(str1, 2);
        Console.WriteLine(result);

        // checking for lowercase letter in a
        // string at a desired position
        string str2 = "geeksForgeeks";
        result = Char.IsLower(str2, 5);
        Console.WriteLine(result);
    }
}

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