Could not change combobox to readonly

using System;
using System.Windows.Forms;

namespace ReadOnlyComboBoxExample
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
            
            //Populate your ComboBox with some items...
            comboBox1.Items.Add("Item 1");
            comboBox1.Items.Add("Item 2");
            comboBox1.Items.Add("Item 3");
            
            //Set the initial selection...
            comboBox1.SelectedIndex = 0;
            
            //Disable user input to make it read-only as suggested by OriginalGriff...
            comboBox1.DropDownStyle = ComboBoxStyle.DropDownList;
        }

        //Handle the SelectedIndexChanged event to prevent changes...
        private void comboBox1_SelectedIndexChanged(object sender, EventArgs e)
        {
            //This event will be triggered if the user tries to change the selection.
            //You can keep it empty to prevent any action when the selection changes.
            //OR you can show a message or perform any custom logic if needed in this block...
        }
    }
}