<a href="Default2.aspx?id=123&type=11ad">打开第二个页面id=123</a><br><a href="Default2.aspx?id=12&type=11ad">打开第二个页面id=12</a>

<asp:Label ID="Label1" runat="server" Text="Label"></asp:Label><asp:Button ID="Button1" runat="server" Text="Button" OnClick="Button1_Click" />

protected void Page_Load(object sender, EventArgs e)    {        string type = Request.QueryString["type"].ToString();        if (!IsPostBack)        {            if (Cache["‘" + type + "‘"] == null)            {                msg();            }            else            {                if (Cache["‘" + type + "‘"].ToString() == Request.QueryString["id"].ToString())                {                    Label1.Text = "我可以进入这个页面";                }                else                {                    Label1.Text = "有人已经进入该页面，请稍后。。。";                    Button1.Visible = false;                }            }        }            }        private void msg()    {        string type = Request.QueryString["type"];        //Cache["‘" + type + "‘"] = Request.QueryString["id"].ToString();        Cache.Insert("‘"+type+"‘", Request.QueryString["id"].ToString(), null, DateTime.Now.AddSeconds(10), TimeSpan.Zero);        Label1.Text = "我可以进入这个页面";    }    protected void Button1_Click(object sender, EventArgs e)    {        string type = Request.QueryString["type"];        Cache.Remove("‘" + type + "‘");        Response.Redirect("Default.aspx");    }