1using System;
 2using System.Data;
 3using System.Configuration;
 4using System.Collections;
 5using System.Web;
 6using System.Web.Security;
 7using System.Web.UI;
 8using System.Web.UI.WebControls;
 9using System.Web.UI.WebControls.WebParts;
10using System.Web.UI.HtmlControls;
11using System.IO;
12public partial class gif : System.Web.UI.Page
13...{//该源码下载自www.51aspx.com(5１ａｓｐｘ．ｃｏｍ)
14    protected void Page_Load(object sender, EventArgs e)
15    ...{
16        ValidateCode  gif=new  ValidateCode ();//验证码
17        string valid ="";
18        MemoryStream ms = gif.Create ( out valid);
19        Session["sdf"] = valid;//记忆验证码
20       //清空输出
21        Response.ClearContent();
22        Response.ContentType = "image/png";
23        Response.BinaryWrite(ms.ToArray());//以图片格式输出。
24        Response.End();
25    }
26}
27 
28