session

1. First create a page LogOut.aspx and in Page_Load event, write this code:

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protected void Page_Load(object sender, EventArgs e) {     Session.Abandon(); }

2. Then add the following JavaScript code in your page or Master Page:

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<script type="text/javascript">   var clicked = false;    function CheckBrowser()      {             if (clicked == false)             {                 //Browser closed             }        else             {             //redirected              clicked = false;             }     }     function bodyUnload()     {             if (clicked == false)//browser is closed             {             var request = GetRequest();              request.open  ("POST", "../LogOut.aspx", false);            request.send();             }     }       function GetRequest()        {             var xmlhttp;         if (window.XMLHttpRequest) {// code for IE7+, Firefox, Chrome, Opera, Safari             xmlhttp = new XMLHttpRequest();         }         else {// code for IE6, IE5             xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");         }         return xmlhttp;       }    script>

3. Add the following code in the body tag of master page:

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<body onunload="bodyUnload();" Onclick="clicked=true;">

Finally the code in Master page like this:

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