karacsonyGUI-WinForm-2021maj

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 karacsonyGUI
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            elkeszit_textBox1.Text = 0.ToString();
            eladott_textBox2.Text = 0.ToString();
            for (int i = 1; i < 41; i++)
            {
                comboBox1.Items.Add(i);
            }
        }

        private void hozzaad_button1_Click(object sender, EventArgs e)
        {
            bool hibas = true;
            hiba.ForeColor = Color.Red;
            if (Convert.ToInt32(elkeszit_textBox1.Text)<0|| Convert.ToInt32(eladott_textBox2.Text)<0)
            {
                hibas = false;
                hiba.Text = ("Negatív számot nem adhat meg!");
            }
            if (Convert.ToInt32(eladott_textBox2.Text)>Convert.ToInt32(elkeszit_textBox1.Text))
            {
                hibas = false;
                hiba.Text = ("Túl sok az eladott angyalka!");
            }
            if (hibas==true)
            {
                listBox1.Items.Add($"{comboBox1.Text}.nap\t+{elkeszit_textBox1.Text}\t-     {eladott_textBox2.Text}\t=\t{Convert.ToInt32(elkeszit_textBox1.Text)-Convert.ToInt32(eladott_textBox2.Text)}");
                hiba.Text = "";
            }
            elkeszit_textBox1.Text = "0";
            eladott_textBox2.Text = "0";
            //for (int i = 1; i <= comboBox1; i++)
            //{
            //    napok.Items.Remove(i);
            //}
        }
    }
}