System Drawing Drawing2d C# by API

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Drawing.Drawing2D;
using System.Text;
using System.Windows.Forms;
public class Form1 : Form {
    protected override void OnPaint(PaintEventArgs e) {
    Graphics g = e.Graphics;
    HatchBrush hb = new HatchBrush(
              HatchStyle.Cross,
              Color.White,
              Color.Black);
    g.FillRectangle(hb, this.ClientRectangle);
    hb.Dispose();
    }
    public static void Main() {
        Application.Run(new Form1());
    }
}