Asp.net验证码-顶誉参考源代码

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<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title></title>
</head>
<body>
<form id="form1" runat="server">
<div>

<asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>
<asp:Image ID="Image1" runat="server" ImageUrl="~/Handler.ashx" onclick="this.src=this.src+'?'"/>
<hr />

<img alt="" src="Handler.ashx" onclick="this.src=this.src+'?'"/>
<hr />
<asp:Button ID="Button1" runat="server" Text="验证" onclick="Button1_Click"
/>
</div>
</form>
</body>
</html>

--------------------------------------------------------------------------------------------------------

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;

public partial class _Default : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{

}
protected void Button1_Click(object sender, EventArgs e)
{
if (Session["myID"].ToString() == this.TextBox1.Text)
{
Response.Write("OK!");
}
else
{
Response.Write("No!");
}

}
}

----------------------------------------------------------------------------------------------------------------

<%@ WebHandler Language="C#" Class="Handler" %>

using System;
using System.Web;
using System.Drawing;
using System.Drawing.Imaging;
using System.Text;
using System.Web.SessionState;

public class Handler : IHttpHandler,IRequiresSessionState
{
private const int totalLength = 5; //声明验证码总的长度

public void ProcessRequest(HttpContext context)
{
context.Response.ContentType = "image/gif";
Bitmap b = new Bitmap(200, 60);
//准备画布
Graphics g = Graphics.FromImage(b);
Font font = new Font(FontFamily.GenericSerif, 48, FontStyle.Bold, GraphicsUnit.Pixel);

//随机产生字串
Random R = new Random();
//原始字串
string letters = "qazwsxedcrfvtgbyhnujmikolp";
StringBuilder s = new StringBuilder();
for (int i = 0; i < totalLength; i++)
{
s.Append(letters.Substring(R.Next(0, letters.Length - 1), 1));
g.DrawString(s[s.Length - 1].ToString(), font, new SolidBrush(Color.White), i * 38, R.Next(0, 15));
}

//干扰线
Pen pen = new Pen(new SolidBrush(Color.Blue), 2);
for (int i = 0; i < 5; i++)
{
g.DrawLine(pen, new Point(R.Next(0, 199), R.Next(0, 59)), new Point(R.Next(0, 199), R.Next(0, 59)));
}
b.Save(context.Response.OutputStream, ImageFormat.Gif);
context.Session["myID"] = s.ToString();
context.Response.End();
g.Dispose();
b.Dispose();
}

public bool IsReusable
{
get
{
return false;
}
}

}