C# if/else first statement working, this rest are not

I know this is probably very basic, and I googled it and have gone through the search, but I'm having an issue which a very basic if/else scenario. The first statement produces results, which tells me that I've messed up the other statements somehow. It's driving me a little crazy. FYI, this is my first experience with a form window.

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 Wk2_Part1
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {  
            int season;
            int job;
            season = Convert.ToInt32(textBox1.Text);
            job = Convert.ToInt32(textBox2.Text);
            if (season == 1)
                if (job == 1)
                    label3.Text = "There is a 20% discount on the exterior job";
            else
                if (season == 2)
                    if (job == 1)
                        label3.Text = "There is a 20% discount on the exterior job";
            else
                if (season == 3)
                    if (job == 2)
                        label3.Text = "There is a 30% discount on the interior job";
            else
                 label3.Text = "No discount, regular prices apply";
        }
    }
 }