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<script runat="server" language="C#">
    protected void Application_Start(object sender, EventArgs e)
    {
        Application["nusers"] = 0;
    }
    protected void Session_Start(object sender, EventArgs e)
    {
        Application["nusers"] = (int)Application["nusers"] + 1;
    }
    protected void Session_End(object sender, EventArgs e)
    {
        Application["nusers"] = (int)Application["nusers"] + 2;
    }
</script>