using System;

using System.Collections.Generic;

using System.Linq;

​

public class Program

{

    public static void Main()

    {

        var dict = new Dictionary<int, string>();

        dict.Add(1, "One");

        dict.Add(2, "Two");

        dict.Add(3, "Three");

        dict.Add(4, "Four");

        dict.Add(5, "Two");

        var res = dict.Where(x => x.Value == "Two").First();

        Console.WriteLine(res.Key);

        Console.WriteLine(res.Value);

        var numbers = new List<int>(){ 5, 6, 3, 1, 9, 7, 2, 4, 0};

        var res1 = numbers.Where(y => y > 3 && y < 7).ToList();

        foreach(int item in res1)

        {

            Console.WriteLine(item);

        }

        res1.Sort();

        foreach(int item in res1)

        {

            Console.WriteLine(item);

        }

    }

}