počítadlo

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace pocitadlo
{
    public partial class Form1 : Form
    {
        int day; int month; int year; int aday; int amonth; int ayear;
        byte[] months = new byte[13] { 0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 };

        public Form1()
        {
            InitializeComponent();
        }

        private void checkDatum_CheckedChanged(object sender, EventArgs e)
        {
            if (checkDatum.Checked == false)
            {
                txtADay.Visible = true;
                txtAMonth.Visible = true;
                txtAYear.Visible = true;
                labelDatum.Visible = true;
                btnSend.Location = new Point(265, 104);
            }
            else
            {
                txtADay.Visible = false;
                txtAMonth.Visible = false;
                txtAYear.Visible = false;
                labelDatum.Visible = false;
                btnSend.Location = new Point(162, 104);
            }
        }

        private void btnSend_Click(object sender, EventArgs e)
        {
            int s1 = 0; int s2 = 0; int v = 0; int age = 0;
            if (checkDatum.Checked == true)
            {
                aday = DateTime.Now.Day;
                amonth = DateTime.Now.Month;
                ayear = DateTime.Now.Year;
            }
            else
            {
                aday = int.Parse(txtADay.Text);
                amonth = int.Parse(txtAMonth.Text);
                ayear = int.Parse(txtAYear.Text);
            }
            day = int.Parse(txtDay.Text);
            month = int.Parse(txtMonth.Text);
            year = int.Parse(txtYear.Text);
            if (year % 4 == 0 && ayear % 4 == 0)
                months[2] = 29;
            else months[2] = 28;
            for (int i = 1; i <= month; i++)
                s1 += months[i];
            for (int i = 1; i <= amonth; i++)
                s2 += months[i];
            v = (s1 + day) - (s2 + aday);
            if (day == aday && month == amonth)
            {
                age = ayear - year;
                if (year % 4 == 0 && ayear % 4 == 0)
                    v = v + 366;
                else v = v + 365;
            }
            else age = (ayear - year) - 1;
            if (v < 0)
            {
                age++;
                if (year % 4 == 0 && ayear % 4 == 0)
                    v = v + 366;
                else v = v + 365;
            }
            Output1.Text = "Máš "+ age +" rokov";
            Output2.Text = "Za "+ v + " dní budeš mať narodeniny";
        }
    }
}