File list (Check if you may need any files):
6.绘制登录验证码\123.jpg
................\dl.aspx
................\dl.aspx.cs
................\NumberAndLetter.aspx
................\NumberAndLetter.aspx.cs
................\web.config
................\UserValidator\NumAndLetCheckCode.aspx
................\.............\NumAndLetCheckCode.aspx.cs
................\MasterPage\MasterPage.master
................\..........\MasterPage.master.cs
................\Images\left_bg_02.jpg
................\......\lineS.jpg
................\......\login.css
................\......\Login.GIF
................\......\loginBg.jpg
................\......\login_line_1.jpg
................\......\login_line_2.jpg
................\......\login_logo.jpg
................\......\login_right_bk.jpg
................\......\login_shadow.jpg
................\......\RESET.GIF
................\......\rightbg_06.jpg
................\......\Thumbs.db
................\UserValidator
................\MasterPage
................\Images
................\App_Data
6.绘制登录验证码