如何在winforms中创建两个带边框的圆角？

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

public partial class MainForm : Form
{
    public MainForm()
    {
        InitializeComponent();
        SetRoundShape(panel1, 10); // 设置圆角半径为10像素
    }

    // 设置控件的圆角形状
    private void SetRoundShape(Control control, int radius)
    {
        GraphicsPath path = new GraphicsPath();
        path.AddArc(0, 0, radius, radius, 180, 90);
        path.AddArc(control.Width - radius, 0, radius, radius, 270, 90);
        path.AddArc(control.Width - radius, control.Height - radius, radius, radius, 0, 90);
        path.AddArc(0, control.Height - radius, radius, radius, 90, 90);
        control.Region = new Region(path);
    }
}