Practical 1b: Demonstrate string operations.

using System;

class Program
{
    static void Main()
    {
        string sample = "Hello, C# Programming!";
        
        // String Length
        Console.WriteLine("Length of string: " + sample.Length);
        
        // Convert to uppercase
        Console.WriteLine("Uppercase: " + sample.ToUpper());
        
        // Convert to lowercase
        Console.WriteLine("Lowercase: " + sample.ToLower());
        
        // Substring example
        Console.WriteLine("Substring (5, 3): " + sample.Substring(5, 3));
        
        // Concatenation
        string anotherString = " Let's code!";
        Console.WriteLine("Concatenated string: " + string.Concat(sample, anotherString));
        
        // Replace example
        Console.WriteLine("Replace 'C#' with '.NET': " + sample.Replace("C#", ".NET"));
    }
}