c# listbox search In .net

This is A C# Practice 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 database
{
    public partial class ListboxSearch : Form
    {
        public ListboxSearch()
        {
            InitializeComponent();
        }


        private void button1_Click(object sender, EventArgs e)
        {
            listBox1.SelectedItems.Clear();
            for (int num = listBox1.Items.Count -1; num >= 0; num--)
            {
                if (listBox1.Items[num].ToString().ToLower().Contains(textBox3.Text.ToLower()))
                {
                    listBox1.SetSelected(num,true);
                }
            }
            label3.Text = listBox1.SelectedItems.Count.ToString(); ;
        }


        private void textBox3_TextChanged(object sender, EventArgs e)
        {


        }


        private void listBox1_SelectedIndexChanged(object sender, EventArgs e)
        {


        }
    }
}

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