請問淘寶網上的登錄頁面中的校检码(數字圖片)是怎樣做的呀?

Question

// 在此处放置用户代码以初始化页面
string ValidateString=(string)Session["ValidateString"];
            int height=20;
int length=ValidateString.Length*12;
System.Drawing.Bitmap image=new Bitmap(length,height);
            System.Drawing.Graphics graphic=Graphics.FromImage(image);
graphic.DrawString(ValidateString,(new Font("Lucida Calligraphy",12)),(new SolidBrush(Color.Blue)),3,0);
MemoryStream stream=new MemoryStream();
image.Save(stream,ImageFormat.Png);
Response.ClearContent();
Response.BinaryWrite(stream.ToArray());
            graphic.Dispose();
image.Dispose();
Response.End();

Answer 1

可不可以給我完整的代碼呀??