ASP.NET Tutorial/Page Lifecycle/Mime type

Gif image

<%@ Page language="c#" %>
<%@ Import Namespace="System.Drawing" %>
<%@ Import Namespace="System.Drawing.Imaging" %>
<%@ Import Namespace="System.Drawing.Drawing2D" %>
<%@ Import Namespace="System.Drawing.Text" %>
<script runat="server">
    private void Page_Load(object sender, System.EventArgs e)
    {
      Bitmap InputBitmap = new Bitmap(Server.MapPath("logo.gif"));
      
      int newWidth = 100;
      int newHeight = 100;
      Bitmap OutputBitmap = new Bitmap(InputBitmap, newWidth, newHeight);
      Response.Clear();
      Response.ContentType="image/Gif";
      OutputBitmap.Save(Response.OutputStream, ImageFormat.Gif);
      OutputBitmap.Dispose();
      InputBitmap.Dispose();
    }
</script>

JPeg image

<%@ Page language="c#" %>
<%@ Import Namespace="System.Drawing" %>
<%@ Import Namespace="System.Drawing.Imaging" %>
<%@ Import Namespace="System.Drawing.Drawing2D" %>
<%@ Import Namespace="System.Drawing.Text" %>
<script runat="server">
    private void Page_Load(object sender, System.EventArgs e)
    {
      Bitmap OutputBitmap = new Bitmap(Server.MapPath("1.jpg"));
      Graphics DrawGraphic = Graphics.FromImage(OutputBitmap);
      DrawGraphic.SmoothingMode = SmoothingMode.AntiAlias;
      DrawGraphic.TextRenderingHint = TextRenderingHint.AntiAlias;
      String MessageString = System.DateTime.Now.ToString();
      DrawGraphic.DrawString(MessageString, 
        new Font("arial",8,FontStyle.Bold),
        Brushes.DarkBlue, new PointF(10,22));
      Response.Clear();
      Response.ContentType="image/jpeg";
      OutputBitmap.Save(Response.OutputStream, ImageFormat.Jpeg);
      OutputBitmap.Dispose();
      DrawGraphic.Dispose();
    }
</script>

set the mime type

<%@ Page language="c#" %>
<%@ Import Namespace="System.Drawing" %>
<%@ Import Namespace="System.Drawing.Imaging" %>
<%@ Import Namespace="System.Drawing.Drawing2D" %>
<%@ Import Namespace="System.Drawing.Text" %>
<script runat="server">
    private void Page_Load(object sender, System.EventArgs e)
    {
      Bitmap OutputBitmap = new Bitmap(320,200);
      Graphics DrawGraphic = Graphics.FromImage(OutputBitmap);
      DrawGraphic.Clear(Color.Beige);
      
      DrawGraphic.SmoothingMode = SmoothingMode.AntiAlias;
      DrawGraphic.TextRenderingHint = TextRenderingHint.AntiAlias;
      String MessageString = System.DateTime.Now.ToString();
      DrawGraphic.DrawString(MessageString, 
        new Font("arial",18,FontStyle.Bold),
        Brushes.DarkBlue, new PointF(20,20));
      Response.Clear();
      Response.ContentType="image/jpeg";
      OutputBitmap.Save(Response.OutputStream, ImageFormat.Jpeg);
      OutputBitmap.Dispose();
      DrawGraphic.Dispose();
    }
</script>