使用C#更新Windows窗体中的文本框时,如何编写"闪存"效果？

using System;
using System.Drawing;
using System.Threading;
using System.Windows.Forms;

namespace FlashingTextBox
{
    public partial class Form1 : Form
    {
        private bool isFlashing = false;
        private Color originalBackColor;

        public Form1()
        {
            InitializeComponent();
            originalBackColor = textBox1.BackColor;
        }

        private void button1_Click(object sender, EventArgs e)
        {
            if (!isFlashing)
            {
                isFlashing = true;
                Thread flashThread = new Thread(new ThreadStart(FlashTextBox));
                flashThread.Start();
            }
        }

        private void FlashTextBox()
        {
            while (isFlashing)
            {
                textBox1.BackColor = Color.Red;
                Thread.Sleep(500);
                textBox1.BackColor = originalBackColor;
                Thread.Sleep(500);
            }
        }

        private void button2_Click(object sender, EventArgs e)
        {
            isFlashing = false;
            textBox1.BackColor = originalBackColor;
        }
    }
}