ExtentionMethods

/==================================

using System;

public static class StringExtensions

{

    // Extension method to capitalize the first letter of a string

    public static string CapitalizeFirstLetter(this string input)

    {

        if (string.IsNullOrEmpty(input))

            return input;

        return char.ToUpper(input[0]) + input.Substring(1);

    }

}

class Program

{

    static void Main()

    {

        string text = "hello world";

        // Using the extension method

        string capitalizedText = text.CapitalizeFirstLetter();

        Console.WriteLine(capitalizedText); // Output: Hello world

    }

}