using System;

public class Program

{

    public static void Main()

    {

        Int64 start = 0x3B050002F10673;

        //Convert.ToInt16("3B050002F10673");

        Console.WriteLine("start"); Console.WriteLine(start);

​

        Int64 a_26_only = start & 0x3FFFFFF; //26 bits, 11 1111 1111 1111 1111 1111 1111

        Console.WriteLine("a_26_only"); Console.WriteLine(a_26_only);

        Console.WriteLine(Convert.ToString(a_26_only, 2));

        Console.WriteLine("0x3FFFFFF"); Console.WriteLine(0x3FFFFFF);

        Int64 a_without_parity = a_26_only >> 1;

        Console.WriteLine("a_without_parity"); Console.WriteLine(a_without_parity);

        //Finally, the card number is the right-most 16 bits:

        Int64 card_number = a_without_parity & 0xffff;

        Console.WriteLine("card_number"); Console.WriteLine(card_number);

        //Finally, the card number is the right-most 16 bits:

        Int64 card_number2 = a_without_parity & (long)(Math.Pow(2,16)-1);

        Console.WriteLine("card_number2"); Console.WriteLine(card_number2);

        //And the facility code is the next 8 bits:

        Int64 facility_code = (a_without_parity >> 16 ) & 0xff;

        Console.WriteLine("facility_code"); Console.WriteLine(facility_code);

        //And the facility code is the next 8 bits:

        Int64 facility_code2 = (a_without_parity >> 16 ) & (long)(Math.Pow(2,8)-1);

        Console.WriteLine("facility_code2"); Console.WriteLine(facility_code2);

        double x = Math.Pow(2,8);

        Console.WriteLine(x);

    }

}