var numbers = new List<int> { 1, 2, 3 };
var query = numbers.Where(n => n > 1);

numbers.Add(4);

foreach (var n in query)
    Console.Write(n + " ");

Архитектура компьютерных систем. Как собрать современный компьютер по всем правилам

using System;

class Program
{
    static int Test()
    {
        try
        {
            return 1;
        }
        finally
        {
            Console.WriteLine("finally");
        }
    }

    static void Main()
    {
        Console.WriteLine(Test());
    }
}

using System;
using System.Collections.Generic;

class Program
{
    static void Main()
    {
        var actions = new List<Action>();

        for (int i = 0; i < 3; i++)
        {
            actions.Add(() => Console.Write(i));
        }

        foreach (var action in actions)
        {
            action();
        }
    }
}

using System;

class Program
{
    static void Main()
    {
        string a = "hello";
        string b = "he" + "llo";

        Console.WriteLine(object.ReferenceEquals(a, b));
    }
}

using System;

class Program
{
    static void Main()
    {
        int[] numbers = { 1, 2, 3 };

        foreach (var n in numbers)
        {
            int copy = n;

            copy++;
        }

        Console.WriteLine(string.Join(" ", numbers));
    }
}

using System;

class Program
{
    static void Main()
    {
        int? x = null;

        Console.WriteLine(x is int);
    }
}

using System;

class Program
{
    static void Print(object x)
    {
        Console.Write("object");
    }

    static void Print(string x)
    {
        Console.Write("string");
    }

    static void Main()
    {
        Print(null);
    }
}