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copied!<p>A solution to that problem can be implemented by the following:</p> <pre><code>public static class CommonHelper { public static bool SiteGuard { get { if(HttpContext.Current.Session["SiteGuard"] == null) return true; return (bool)HttpContext.Current.Session["SiteGuard"]; } set { HttpContext.Current.Session["SiteGuard"] = value; } } } public partial class TestPage : System.Web.UI.Page { protected void Page_Load(object sender, EventArgs e) { if(!Page.IsPostBack) { bool go = false; for(int i = 0; i < 50; i++) // wait for the service to work (5 secs max) { if(CommonHelper.SiteGuard) { go = true; break; } Thread.Sleep(100); } if(!go) Response.Redirect("Login.aspx"); SiteGuard = false; // from now on, nobody can visit your site } // Now as long as Page.IsPostBack is true you are in a good shape } } </code></pre> <p>Add an asmx web service (or any other type of services you think is suitable) to your root project and add the following method to it:</p> <pre><code> [WebMethod(EnableSession = true)] public void FreeSiteGuard() { HttpContext.Current.Session["SiteGuard"] = null; } </code></pre> <p>In the master page, or on every page add the following javascript:</p> <pre><code><script type="text/javascript"> window.onbeforeunload = function (e) { e = e || window.event; if (e) { // Invoke web service YourProject.YourWebServiceName.FreeSiteGuard(); } }; </script> </code></pre> <p>Note that your site response time gets affected by the speed of the web service.</p>

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