Cache使用

Default.aspx：

<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>

Default2.aspx：

<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");
    }