Draw a bitmap image in asp.net

Draw a bitmap image in asp.net.
Add this namespace

using System.Drawing;
using System.Drawing.Imaging;

Write this code on ASPX.CS page

protected void Page_Load(object sender, EventArgs e)
{
    Bitmap bitmapimg = new Bitmap(120, 120, PixelFormat.Format32bppArgb);
    Graphics grph = Graphics.FromImage(bitmapimg);
    SolidBrush br = new SolidBrush(Color.Green);
    grph.FillEllipse(br, 4, 4, 110, 110);
    Response.ContentType = "image/gif";
    bitmapimg.Save(Response.OutputStream, ImageFormat.Gif);
    bitmapimg.Dispose();
}