Implementation method of C# graphics area cutting

using System;
using ;
using ;
using ;
using ;
using ;
using ;
using .Drawing2D;
namespace advanced_drawing
{
  public partial class Form16 : Form
  {
    public Form16()
    {
      InitializeComponent();
    }
    private void Form16_Paint(object sender, PaintEventArgs e)
    {
      Graphics g = ;
      GraphicsPath path = new GraphicsPath();
      ();
      Region regoin = new Region(path);
      (, path);
       = regoin;
      Rectangle rect = ;
      (10, 10);
       -= 20;
       -= 20;
      (, rect);
      ("zhuzhao", , , 100, 100);
    }
  }
}