asp.net系统，在登录或注册时常提供数字或字符混合的验证码，这里介绍如何操作。
1，Default 页面
<%@ Page Language="C#" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<script runat="server">
protected void Button2_Click(object sender, EventArgs e)
{
if (Request.Cookies["ycode"] != null)
{
if (Request.Cookies["ycode"].Value.ToString() == this.TextBox1.Text.Trim())
{
Response.Redirect("Default2.aspx");
}
}
}
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title></title>
<script src="js/jquery.js" type="text/javascript"></script>
<script src="js/JScript.js" type="text/javascript"></script>
</head>
<body>
<form id="form1" runat="server">
<div>
<img id="img1" src="CreateCode.aspx" alt="点击" onclick="hp()"/>
<input id="Button1" type="button" value="button" onclick="return Button1_onclick()" /><br />
<asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>
<asp:Button ID="Button2" runat="server" OnClick="Button2_Click" Text="Button" /></div>
&nbs
