c# da Sıcaklıga göre uyarı yapan program

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

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

        private void label2_Click(object sender, EventArgs e)
        {

        }

        private void button1_Click(object sender, EventArgs e)
        {
            int sck;
            sck = int.Parse(textBox1.Text);
            if(sck<=0) label1.ForeColor=Color.Red;
            if(sck>0 || sck<=20 ) label1.ForeColor=Color.Blue;
            if (sck > 20 || sck<=40) label1.ForeColor = Color.White;
           if (sck>40) label1.ForeColor = Color.Yellow;
        }
    }
}