程序中保存状态的方式之 Cookies，之前写过一篇关于的。现在继续总结Cookies方式的

新建的测试页面login

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Login.aspx.cs" Inherits="Login" %>            
      
           登录名：
           密码：
           
           
      

后台.cs文件

using System;using System.Collections.Generic;using System.Linq;using System.Web;using System.Web.UI;using System.Web.UI.WebControls;using System.Data;public partial class Login : System.Web.UI.Page{    protected void Page_Load(object sender, EventArgs e)    {    }    protected void btn_login_Click(object sender, EventArgs e)    {        string name = txtName.Text.Trim();        string pwd = txtPwd.Text.Trim();        if (name == string.Empty)        {            MessageBox.Show(this, "请输入用户名！");            return;        }        if (pwd == string.Empty)        {                       MessageBox.Show(this, "请输入密码！");            return;        }            if (name == "test" && pwd == "123456")        {            Response.Cookies.Add(new HttpCookie("comID", "100"));            Response.Cookies["comID"].Expires = DateTime.Now.AddDays(30);//设置过期时间,30天            Response.Redirect("获取cookies.aspx");        }        else {            MessageBox.Show(this,"用户名密码错误！");        }            }        }

获取cookies.aspx页面后台

using System;using System.Collections.Generic;using System.Linq;using System.Web;using System.Web.UI;using System.Web.UI.WebControls;using System.Data;public partial class 获取cookies : System.Web.UI.Page{    public string comid = "";    protected void Page_Load(object sender, EventArgs e)    {        if (Request.Cookies["comID"] != null && Request.Cookies["comID"].Value != "")        {            comid = Request.Cookies["comID"].Value;//获取存入的comid        }        MessageBox.Show(this, "登录id=" + comid);    }}

删除Cookies

Response.Cookies[CountAdmin].Expires = DateTime.Now.AddDays(-1);//删除cookie

我登录的时候存入了100，访问login.aspx就会跳转到获取cookies页面，提示登录id=100,效果图如下：