using System;

using System.Linq;

​

public class Program

{

    public static Random random;

    public static void Main()

    {

        random = new Random((int)DateTime.Now.Ticks);

        var lottoNumbers = Enumerable.Range(1, 80).ToList();

        int[] SelectedNumbers = new int[20];

        for (var i = 0; i < 20; i++)

        {

            var number = GetNumber(lottoNumbers.ToArray());

            while (SelectedNumbers.Contains(number))

            {

                number = GetNumber(lottoNumbers.ToArray());

            }

            SelectedNumbers[i] = number;

        }

​

        Console.WriteLine("Kino Numbers: " + string.Join(" ", SelectedNumbers.OrderBy(n => n)));

    }

​

    //Removes numbers from the array until only one is left, and returns it

    public static int GetNumber(int[] arr)

    {

        if (arr.Length > 1)

        {

            //Remove random number from array

            var r = random.Next(0, arr.Length);

            var list = arr.ToList();

            list.RemoveAt(r);

            return GetNumber(list.ToArray());

        }

​

        return arr[0];

    }

}