C# Program to Find the Sum of Two Binary Numbers

/*
 * C# Program to Find the Sum of two Binary Numbers */
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
namespace ConsoleApplication
{
    class Program
    {
        static void Main(string[] args)
        {
            int b1, b2;
            int i = 0, rem = 0;
            int[] sum = new int[20];
            Console.WriteLine("Enter the first binary number: ");
            b1 = int.Parse(Console.ReadLine());
            Console.WriteLine("Enter the second binary number: ");
            b2 = int.Parse(Console.ReadLine());
            while (b1 != 0 || b2 != 0)
            {
                sum[i++] = (b1 % 10 + b2 % 10 + rem) % 2;
                rem = (b1 % 10 + b2 % 10 + rem) / 2;
                b1 = b1 / 10;
                b2 = b2 / 10;
            }
            if (rem != 0)
                sum[i++] = rem;
            --i;
            Console.WriteLine("Sum of two binary numbers: ");
            while (i >= 0)
                Console.Write("{0}", sum[i--]);
            Console.ReadLine();
        }
    }
}