using System;using System.Collections.Generic;using System.ComponentModel;using System.Data;using System.Drawing;using System.Text;using System.Windows.Forms;using System.Drawing.Drawing2D;namespace advanced_drawing{  public partial class Form3 : Form  {    public Form3()    {      InitializeComponent();    }    private void button1_Click(object sender, EventArgs e)    {      Graphics g = this.CreateGraphics();      g.PageUnit = GraphicsUnit.Inch;      g.PageScale = 1;      PointF[] bottomRight = new PointF[] { new PointF(this.ClientSize.Width, this.ClientSize.Height) };      g.TransformPoints(CoordinateSpace.Page, CoordinateSpace.Device, bottomRight);      Rectangle rect = new Rectangle(0, 0, 10, 10);      Pen pen=new Pen(Color.Red);      g.DrawRectangle(pen, rect);    }  }}