default.aspx.cs

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using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;

using System.Drawing;

public partial class _Default : System.Web.UI.Page 
{
    protected void Page_Load(object sender, EventArgs e)
    {
        Bitmap bitmap = new Bitmap(300, 150);
        Graphics g = Graphics.FromImage(bitmap);
        g.Clear(Color.WhiteSmoke);
        Pen myPen = new Pen(Color.Blue, 5);
        Point[] myPoints ={ new Point(80, 20), new Point(40, 50), new Point(80, 80), new Point(160, 80), new Point(200, 50), new Point(160, 20) };
        g.DrawCurve(myPen, myPoints, 1.0F);
        System.IO.MemoryStream ms = new System.IO.MemoryStream();
        bitmap.Save(ms, System.Drawing.Imaging.ImageFormat.Gif);
        Response.ClearContent();
        Response.ContentType = "image/Gif";
        Response.BinaryWrite(ms.ToArray());
    }
}