Imagem dinâmica - System.Drawing

  
<%@ Page Language="C#" ContentType="image/jpeg" %>
<%@ Import Namespace="System.Drawing" %>
<%@ Import Namespace="System.Drawing.Text" %>
<%@ Import Namespace="System.Drawing.Imaging" %>
<%@ Import Namespace="System.Drawing.Drawing2D" %>

<%

Response.Clear();
int height = 100;
int width = 200;

Bitmap bmp = new Bitmap(width, height, PixelFormat.Format24bppRgb);
Graphics g = Graphics.FromImage(bmp);

g.TextRenderingHint = TextRenderingHint.AntiAlias;
g.Clear(Color.Gold);
g.DrawRectangle(Pens.White, 1, 1, width-3, height-3);
g.DrawRectangle(Pens.Gray, 2, 2, width-3, height-3);
g.DrawRectangle(Pens.Black, 0, 0, width, height);
g.DrawString("Imagem Dinâmica!", new Font("Arial", 12, FontStyle.Italic), 
SystemBrushes.WindowText, new PointF(30,45) );

bmp.Save(Response.OutputStream, ImageFormat.Jpeg);
g.Dispose();
bmp.Dispose();
Response.End();

%>