如何在System.Windows.Forms.TextBox中隐藏输入插入符？

using System;
using System.Windows.Forms;

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

            TextBox textBox = new TextBox();
            textBox.ReadOnly = true;
            textBox.Text = "This is a read-only TextBox.";
            this.Controls.Add(textBox);
        }
    }
}