PIN Validation

using System;
using System.Text.RegularExpressions;

public class PinValidation
{
    public static void Main()
    {
        const string NamePattern = @"^[A-Z][a-z]+ [A-Z][a-z]+$";
        const string PinPattern = @"^\d{10}$";

        int[] checksumMultipliers = { 2, 4, 8, 5, 10, 9, 7, 3, 6 };

        string name = Console.ReadLine();
        string gender = Console.ReadLine();
        string pin = Console.ReadLine();

        if (!Regex.IsMatch(name, NamePattern))
        {
            Console.WriteLine("<h2>Incorrect data</h2>");
            return;
        }

        if (gender != "male" && gender != "female")
        {
            Console.WriteLine("<h2>Incorrect data</h2>");
            return;
        }

        if (!Regex.IsMatch(pin, PinPattern))
        {
            Console.WriteLine("<h2>Incorrect data</h2>");
            return;
        }

        int year = int.Parse(pin.Substring(0, 2));
        int month = int.Parse(pin.Substring(2, 2));
        int day = int.Parse(pin.Substring(4, 2));

        int genderNum = pin[8] - '0';

        if (21 <= month && month <= 32)
        {
            year += 1800;
            month -= 20;
        }
        else if (41 <= month && month < 52)
        {
            year += 2000;
            month -= 40;
        }
        else if (1 <= month && month <= 12)
        {
            year += 1900;
        }
        else
        {
            Console.WriteLine("<h2>Incorrect data</h2>");
            return;
        }

        try
        {
            new DateTime(year, month, day);
        }
        catch (Exception ex)
        {
            Console.WriteLine("<h2>Incorrect data</h2>");
            return;
        }

        if (gender == "male" && genderNum % 2 != 0)
        {
            Console.WriteLine("<h2>Incorrect data</h2>");
            return;
        }

        if (gender == "female" && genderNum % 2 == 0)
        {
            Console.WriteLine("<h2>Incorrect data</h2>");
            return;
        }

        int checksum = 0;

        for (int i = 0; i < 9; i++)
        {
            checksum += checksumMultipliers[i] * (pin[i] - '0');
        }

        int hash = checksum % 11;

        if (hash == 10)
        {
            hash = 0;
        }

        if (hash != pin[9] - '0')
        {
            Console.WriteLine("<h2>Incorrect data</h2>");
            return;
        }

        Console.WriteLine(
            "{{\"name\":\"{0}\",\"gender\":\"{1}\",\"pin\":\"{2}\"}}",
            name,
            gender,
            pin);
    }
}