private void Form1_Load(object sender, EventArgs e)
        {
            ieViewer1.Image.LoadImage(@"C:\sample.jpg");
        }

        private void ieViewer1_Paint(object sender, PaintEventArgs e)
        {
            e.Graphics.PageUnit = GraphicsUnit.Pixel;
            // Create pen.
            Pen blackPen = new Pen(Color.Black, 2f);

            // Create rectangle.
            Rectangle rect = new Rectangle(0, 0, 100, 100);

            // Draw rectangle to screen.
            e.Graphics.DrawRectangle(blackPen, rect);
        }