怎么写判断用户是否登录

如图当我输入“朱洪涛的”时候，点击进入论坛就会弹出“欢迎朱洪涛会员”。
Default.aspx代码为
<%@ 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>无标题页</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>

        <asp:Label ID="Label1" runat="server" Text="请输入会员名称："></asp:Label>
        <asp:TextBox ID="TextBox1" runat="server" ></asp:TextBox>
        <asp:Button ID="Button1" runat="server" onclick="Button1_Click" Text="进入论坛" />

    </div>
    </form>
</body>
</html>
Default.aspx.csusing System;
using System.Configuration;
using System.Data;
using System.Linq;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Xml.Linq;

public partial class _Default : System.Web.UI.Page
{
   /* protected void Page_Load(object sender, EventArgs e)
    {
        string mc = BS201102.DSQL.GetDataFieldBySearch("select mc from cs1");

        BS201102.Other.MyControl.Alerts(mc);
    }
    * */
    protected void Button1_Click(object sender, EventArgs e)
    {
        BS201102.Other.MyControl.Alerts("欢迎朱洪涛会员！");
    }
    }
--------------------编程问答-------------------- 利用session啊，网上很多的 --------------------编程问答-------------------- 用session保存. --------------------编程问答-------------------- 利用cookie(“登陆标志”)，赋值：登陆为“1”，未登陆为“0”
需要的时候取cookie(“登陆标志”)的值，进行判断就可以了 --------------------编程问答-------------------- 给你点代码，网上都有
    /// <summary>
    /// Cookie赋值
    /// </summary>
    /// <param name="strName"></param>
    /// <param name="strValue"></param>
    /// <param name="strDay"></param>
    /// <returns></returns>
    public static bool setCookie(string strName, string strValue, int strDay)
    {
        try
        {
            HttpCookie Cookie = new HttpCookie(strName);
            Cookie.Expires = DateTime.Now.AddDays(strDay);
            Cookie.Value = strValue;
            System.Web.HttpContext.Current.Response.Cookies.Add(Cookie);
            return true;
        }
        catch {
            return false;
        }
    }

    /// <summary>
    /// Cookie读取
    /// </summary>
    /// <param name="strName"></param>
    /// <returns></returns>
    public static string getCookie(string strName)
    {
        HttpCookie Cookie = System.Web.HttpContext.Current.Request.Cookies[strName];
        if (Cookie != null)
            return Cookie.Value.ToString();
        else
            return null;
    }

除此之外，用Session["登陆标志"]来保存登陆情况也可以 --------------------编程问答-------------------- 用一個session來保存就可以了 --------------------编程问答-------------------- 用session保存变量 --------------------编程问答--------------------

不敢保证对。我是菜鸟



   UserCookie["name"]=username;

                

                UserCookie.Expires=DateTime.Now.AddDays(1);

                Response.Cookies.Add(UserCookie);

补充：.NET技术 ,  C#