Написание графического редактора

     private void toolStripMenuItem1_Click(object sender, EventArgs e)
        {
            pictureBox1.Visible = true;
            OpenFileDialog fd = new OpenFileDialog();
            fd.Title = "First step Site";
            fd.Filter = "All files (*.*)|*.*|All files (*.*)|*.*";
            if (fd.ShowDialog() == DialogResult.OK)
            {
                pictureBox1.Image = Image.FromFile(fd.FileName);
                MessageBox.Show("открыт Файл");
                RectangleF rect = new RectangleF(100.0F, 100.0F, 450.0F, 150.0F);
System.Drawing.Graphics.DrawImage(System.Drawing.Image.FromFile("1.jpg"), System.Drawing.RectangleF(rect));
            }
        }

protected override void OnPaint(PaintEventArgs e)
{
      RectangleF rect = new RectangleF(100.0F, 100.0F, 450.0F, 150.0F);
      e.Graphics.DrawImage(Image.FromFile("filename"), rect);
}

  private void Form1_Load(object sender, System.EventArgs e)
        {
            pictureBox1.Dock = DockStyle.Fill;
            pictureBox1.BackColor = Color.White;
            pictureBox1.Paint += new System.Windows.Forms.PaintEventHandler(this.pictureBox1_Paint);
                    
            this.Controls.Add(pictureBox1);
        }
 
        private void pictureBox1_Paint(object sender, System.Windows.Forms.PaintEventArgs e)
        {           
            e.Graphics.DrawString("This is a diagonal line drawn on the control",
                new Font("Arial", 10), System.Drawing.Brushes.Blue, new Point(30, 30));
                e.Graphics.DrawLine(System.Drawing.Pens.Red, 10, 20,
               40, pictureBox1.Bottom);
        }