go from 8bit to number

using System;

namespace ConsoleApp1
{
    class Program
    {
        static void Main(string[] args)
        {
            Random rnd = new Random();
            int num = rnd.Next(0, 1);
            int[] arithmos = new int[8];
            int pollap = 0;
            int synolo = 0;
            int iterator = 0;

            for (int i = 0; i < arithmos.Length; i++)
            {
                arithmos[i] = rnd.Next(0, 2);
                Console.Write(arithmos[i]);
            }

            for (int i=arithmos.Length-1; i>=0; i--)
            {
                switch (iterator)
                {
                    case 0:
                        pollap = 1;
                        break;

                    default: pollap = 2 * pollap;
                        break;
                }

                if (arithmos[i] == 1)
                {
                    synolo += pollap;
                    iterator++;
                }
            }
            Console.WriteLine("\n" + synolo);
        }
    }
}