C#: Compare two substrings using different cultures and ignoring the case of the substrings

Last update on August 25 2025 12:50:36 (UTC/GMT +8 hours)

Write a C# Sharp program to compare two substrings using different cultures and ignore the substring case.

Sample Solution:-

C# Sharp Code:

using System;
using System.Globalization;

// Define the Example23 class
class Example23
{
    // Main method - entry point of the program
    public static void Main()
    {
        // Define and initialize string variables
        String str1 = "COMPUTER"; // String 1
        String str2 = "computer"; // String 2
        String str;               // String to store comparison result
        int result;               // Result of the comparison

        // Display initial strings
        Console.WriteLine();
        Console.WriteLine("\n str1 = '{0}', str2 = '{1}'", str1, str2);

        // Ignore case, Turkish culture comparison
        Console.WriteLine("Ignore case, Turkish culture:");
        // Compare a substring of str1 starting at index 4 with a substring of str2 starting at index 4, each with a length of 2, ignoring case using Turkish culture
        result = String.Compare(str1, 4, str2, 4, 2, true, new CultureInfo("tr-TR"));
        // Determine the relationship between the compared substrings
        str = ((result < 0) ? "less than" : ((result > 0) ? "greater than" : "equal to"));
        // Display the comparison result
        Console.Write("Substring '{0}' in '{1}' is ", str1.Substring(4, 2), str1);
        Console.Write("{0} ", str);
        Console.WriteLine("substring '{0}' in '{1}'.", str2.Substring(4, 2), str2);

        Console.WriteLine();
        // Ignore case, invariant culture comparison
        Console.WriteLine("Ignore case, invariant culture:");
        // Compare a substring of str1 starting at index 4 with a substring of str2 starting at index 4, each with a length of 2, ignoring case using invariant culture
        result = String.Compare(str1, 4, str2, 4, 2, true, CultureInfo.InvariantCulture);
        // Determine the relationship between the compared substrings
        str = ((result < 0) ? "less than" : ((result > 0) ? "greater than" : "equal to"));
        // Display the comparison result
        Console.Write("Substring '{0}' in '{1}' is ", str1.Substring(4, 2), str1);
        Console.Write("{0} ", str);
        Console.WriteLine("substring '{0}' in '{1}'.\n\n", str2.Substring(4, 2), str2);
    }
}

Sample Output:

str1 = 'COMPUTER', str2 = 'computer'                                                                          
Ignore case, Turkish culture:                                                                                 
Substring 'UT' in 'COMPUTER' is equal to substring 'ut' in 'computer'.                                        
                                                                                                              
Ignore case, invariant culture:                                                                               
Substring 'UT' in 'COMPUTER' is equal to substring 'ut' in 'computer'.

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