13.Binary to Decimal Number

using System;
    class BinaryToDecimalNumber
    {
        static void Main()
        {
            Console.Write("Enter your binary number: ");
            string binary = Console.ReadLine();
            // Console.WriteLine(Convert.ToInt64(binary, 2));
            long dec = 0;

            for (int i = 0; i < binary.Length; i++)
            {
                if (binary[binary.Length - i - 1] == '0')
                {
                    continue;
                }

                dec += (long)Math.Pow(2, i);
            }

            Console.WriteLine(dec);
        }
    }