HatchBrush hBrush = new HatchBrush(
   HatchStyle.Horizontal,
   Color.Red,
   Color.FromArgb(255, 128, 255, 255));
e.Graphics.FillEllipse(hBrush, 0, 0, 100, 60);

//引入命名空间
using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;

using System.Drawing.Drawing2D;  // LinearGradientBrush

public class Form1 : System.Windows.Forms.Form {
    [STAThread]
    static void Main() {
        Application.Run(new Form1());
    }
    protected override void OnPaint(PaintEventArgs e) {
        Graphics g = e.Graphics;
        Font f = new Font(new FontFamily("Times New Roman"), 10);
        Brush fb = new SolidBrush(Color.Black);
        Color cb = Color.Red, cf = Color.White;

        int wi = 30, hi = 25, rectNb = 14;
        int x, y;
        HatchBrush hb = null;
        for (int i = 0; i < 53; i++) {
            x = (int)(i % rectNb);
            y = (int)(i / rectNb);
            hb = new HatchBrush((HatchStyle)i, cf, cb);
            g.FillRectangle(hb, 2 + x * (5 + wi), 2 + y * (5 + hi), wi, hi);
        }

        fb.Dispose(); hb.Dispose(); g.Dispose();
    }
}