How to save a form as a bitmap or jpeg?

public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
            this.Load+=new EventHandler(Form1_Load);
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            SaveFileDialog saveFileDialog = new SaveFileDialog();

            if (saveFileDialog.ShowDialog() == DialogResult.OK)
            {
                SaveAsBitmap(this, saveFileDialog.FileName);
            }
        }

        public void SaveAsBitmap(Control control, string fileName)
        {
            //getthe instance of the graphics from the control
            Graphics g = control.CreateGraphics();

            //new bitmap object to save the image
            Bitmap bmp = new Bitmap(control.Width, control.Height);

            //Drawing control to the bitmap
            control.DrawToBitmap(bmp, new Rectangle(0, 0, control.Width, control.Height));

            bmp.Save(fileName);
            bmp.Dispose();
        }
    }