Combo box and list box not displaying data

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C#

combobox

ListBox

Hi, im making a windows form which allows users to select films based on a genre. Now, ive made a combo box which gives the users a list of genres, then they select the genre and the films from that genre are displayed in the listbox. I've put the code in correctly and the program compiles ok but when I click on the combo box, the film genres arent displayed. I cant figure out whats wrong with my code, the names are correct and everything.

Heres my code:

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 FilmAndEntertainmentSystem
{
    public partial class FrmFES : Form
    {
        static string ta = null;

        public FrmFES()
        {
            InitializeComponent();
        }

        private void cbxGenre_SelectedIndexChanged(object sender, EventArgs e)
        {
            ta = cbxGenre.SelectedItem.ToString();

            if (ta == "Action/Thriller")
            {
                lbxFilms.Items.Clear();
                lbxFilms.Items.Add("Casino royale");
                lbxFilms.Items.Add("Die Hard");
                lbxFilms.Items.Add("Raiders of the Lost Ark");
            }
            else if (ta == "Sci Fi")
            {
                lbxFilms.Items.Clear();
                lbxFilms.Items.Add("Blade Runner");
                lbxFilms.Items.Add("Star Wars");
                lbxFilms.Items.Add("Star Trek");
            }
            else if (ta == "Horror")
            {
                lbxFilms.Items.Clear();
                lbxFilms.Items.Add("Saw");
                lbxFilms.Items.Add("Psycho");
                lbxFilms.Items.Add("Blade");
            }
            else
            {
                MessageBox.Show("Please select a film genre");
            }


        }
    }
}