我想在我的按钮form application C#的顶部绘制一个椭圆

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

namespace ButtonFormApplication
{
    public partial class MainForm : Form
    {
        public MainForm()
        {
            InitializeComponent();
        }

        protected override void OnPaint(PaintEventArgs e)
        {
            base.OnPaint(e);

            Graphics g = e.Graphics;
            Pen pen = new Pen(Color.Red, 2); // 设置椭圆的颜色和线宽

            int x = 10; // 椭圆的左上角x坐标
            int y = 10; // 椭圆的左上角y坐标
            int width = 100; // 椭圆的宽度
            int height = 50; // 椭圆的高度

            g.DrawEllipse(pen, x, y, width, height); // 绘制椭圆
        }
    }
}