C#

Hello World & Basic Class Example

// Hello World
using System;

class Program
{
    static void Main()
    {
        Console.WriteLine("Hello, World!");
    }
}

// Basic Class Example
using System;

public class Person
{
    // Properties (C# feature)
    public string Name { get; set; }
    public int Age { get; set; }
    
    // Constructor
    public Person(string name, int age)
    {
        Name = name;
        Age = age;
    }
    
    // Method
    public void Introduce()
    {
        Console.WriteLine($"Hi, I'm {Name} and I'm {Age} years old.");
    }
}

class Program
{
    static void Main()
    {
        Person person = new Person("Alice", 25);
        person.Introduce();
    }
}

// Modern C# with LINQ
using System;
using System.Linq;
using System.Collections.Generic;

class Program
{
    static void Main()
    {
        List<int> numbers = new List<int> { 5, 2, 8, 1, 9 };
        
        // LINQ query to filter and sort
        var result = numbers
            .Where(n => n > 3)
            .OrderBy(n => n)
            .ToList();
        
        // Print results
        result.ForEach(Console.WriteLine);
    }
}