PINValidation

using System;
using System.Text.RegularExpressions;

class PINValidation
{
    static void Main()
    {
        var name = Console.ReadLine();
        var gender = Console.ReadLine();
        var pin = Console.ReadLine();

        if (pin.Length == 10 &&
            IsCorrectDate(pin) && IsCorrectGender(pin, gender) &&
            IsCorrectChecksum(pin) && IsNameCorrect(name))
        {
            Console.WriteLine("{{\"name\":\"{0}\",\"gender\":\"{1}\",\"pin\":\"{2}\"}}", name, gender, pin);
        }
        else
        {
            Console.WriteLine("<h2>Incorrect data</h2>");
        }
    }

    private static bool IsCorrectDate(string pin)
    {
        var month = int.Parse(pin.Substring(2, 2));
        var day = int.Parse(pin.Substring(4, 2));
        var year = pin.Substring(0, 2);
        if (month > 40)
        {
            month -= 40;
            year = "20" + year;
        }
        else if (month > 20)
        {
            month -= 20;
            year = "18" + year;
        }
        else
        {
            year = "19" + year;
        }

        var dateString = year + "-" + month + "-" + day;
        DateTime dt;

        return DateTime.TryParse(dateString, out dt);
    }

    static bool IsCorrectGender(string pin, string gender)
    {
        var isIdFemale = (pin[8] - '0') % 2 == 1;
        var isInputFemale = gender == "female";

        return isIdFemale == isInputFemale;
    }

    static bool IsCorrectChecksum(string pin)
    {
        var totalSum = 0;
        var checkSum = pin[9] - '0';
        var numbers = new[] { 2, 4, 8, 5, 10, 9, 7, 3, 6 };

        for (var index = 0; index < numbers.Length; index++)
        {
            var currentDigit = pin[index] - '0';
            totalSum += currentDigit * numbers[index];
        }
        var remainder = totalSum % 11;
        if (remainder == 10)
        {
            remainder = 0;
        }

        return remainder == checkSum;
    }

    static bool IsNameCorrect(string name)
    {
        var nameRegex = new Regex(@"[A-Z][a-z]+\s+[A-Z][a-z]+");
        var match = nameRegex.Match(name);

        return match.Success;
    }
}