asp.net网页动态生成图形

//1,生成Graphics对象

 Bitmap newBitmap = new Bitmap(200, 200, PixelFormat.Format32bppArgb);
    Graphics g = Graphics.FromImage(newBitmap);
//2,图形绘制



//3,输出到页面
MemoryStream tempStream = new MemoryStream();
    newBitmap.Save(tempStream, ImageFormat.Png);
    Response.ClearContent();
    Response.ContentType = "image/png";
    Response.BinaryWrite(tempStream.ToArray());
    Response.Flush();