Csharp/CSharp Tutorial/2D/Draw Rectangle

Draw a rectangle

using System;
using System.Drawing;
using System.Drawing.Drawing2D;
using System.Collections;
using System.ruponentModel;
using System.Windows.Forms;
using System.Data;
public class DrawARectangle : System.Windows.Forms.Form
{
  public DrawARectangle()
  {
    this.BackColor = System.Drawing.Color.White;
    this.ClientSize = new System.Drawing.Size(400, 400);
    this.Paint += new System.Windows.Forms.PaintEventHandler(this.DrawARectangle_Paint);
  }
  static void Main() 
  {
    Application.Run(new DrawARectangle());
  }
  private void DrawARectangle_Paint(object sender, System.Windows.Forms.PaintEventArgs e)
  {
    Graphics g = e.Graphics;
    
    Pen p = new Pen(Color.Black, 5);
    g.DrawRectangle(p, 10, 10, 200, 200);
  }
}

Fill a rectangle with different HatchBrush-Styles

using System;
using System.Drawing;
using System.Collections;
using System.ruponentModel;
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();
    }
}