Session time out alert box and redirect login page in ASP.net

Now I am going to explain how to show alert message to user before extending the session expiration.
Example:
 If you left the website without using it for quite some time and when you used it back, it is redirected to the login page.
This will happen because of session expire or cookies expire. And if it is session expired, you want to show the alert box and redirect to the login page. And one more thing is that if the user keeps on using the website, you want to extend the session expire time. You can achieve this way

Add the css and javascript  in header tag

   <style type="text/css">

        .style

        {

            border-color: Black;

            border-width: 1px;

            border-spacing: 2px;

            border-style: outset;

            border-collapse: separate;

            background-color: #AAC9FC;

            font-family: Verdana;

            font-size: 10px;

        }

    style>

    <script language="javascript" type="text/javascript">

    var checkTimerID;

    var clockID = 0;

    function UpdateClock() {

        var lblValue;

        if (clockID) {

            clearTimeout(clockID);

            clockID = 0;

        }

        if (document.getElementById('divSessionExpirationPopUp').style.display == 'inline') {

            if (navigator.appName == 'Netscape') {

                document.getElementById('lblTime').innerHTML = document.getElementById('lblTime').innerHTML - 1;

                lblValue = document.getElementById('lblTime').innerHTML;

            }

            else {

                document.getElementById('lblTime').innerText = document.getElementById('lblTime').innerText - 1;

                lblValue = document.getElementById('lblTime').innerText;

            }

        }

        if ((lblValue == -1) && (document.getElementById('divSessionExpirationPopUp').style.display == 'inline')) {

            document.getElementById('divSessionExpirationPopUp').style.display = 'none';

            var urlString = unescape(window.location);

            window.location = urlString

        }

        clockID = setTimeout('UpdateClock()', 1000);

    }

    function StartClock() {

        document.getElementById('divOpacity').style.display = 'inline';

        document.getElementById('divSessionExpirationPopUp').style.display = 'inline';

        clockID = setTimeout('UpdateClock()', 0);

    }

 

    function SignOut() {

        window.location = 'Index.aspx';

    }

   

    function GetExtendedSessionMessageUsingCallBack()

    {

        document.getElementById('divOpacity').style.display = 'none';

        document.getElementById('divSessionExpirationPopUp').style.display = 'none';

        document.getElementById('lblTime').innerHTML = 10;

        var checkTimerID;

        checkTimerID = setTimeout('StartClock()', (60000));  //60 minutes

       

    }

 

    script>

    <script language="javascript" type="text/javascript">

    var http;

    try {

        http = new ActiveXObject("Microsoft.XMLHTTP");

    }

    catch (e) {

        http = new XMLHttpRequest();

    }

    function updateData()

     {

         var myurl = "http://localhost:61484/Pages/Dummy.aspx";

        http.open("GET", myurl, true);

        http.onreadystatechange = useHttpResponse;

        http.send(null);

     

    }

    function useHttpResponse() {

        if (http.readyState == 4) {

            var textout = http.responseText;

            GetExtendedSessionMessageUsingCallBack();

        }

    }

    script>

Copy and paste  this code in body  tag .

<div id='divSessionExpirationPopUp' style='position: absolute; z-index: 10000; height: 300px;

        width: 100%; left: 70px; top: 250px; display: none;'>

        <br />

        <table class='style' align='center' valign='middle' width='30%'>

            <tr align='center' valign='middle'>

                <td align='center' valign='top'>

                    <img src='Alert1.jpg' />

                td>

                <td align='left' valign='middle'>

                    <br />

                    <span><b>Your Session will expireb><br />

                    span><span><b>inb>span> <span id='lblTime'>12span> <span><b>sec and you will

                        be b>

                        <br />

                    span><span><b>logged out.b>span>

                    <br />

                    <br />

                    <a href="javascript:void('0');" onclick="javascript:updateData();">Click here to stay

                        logged in.a>

                    <br />

                    <br />

                    <a href='#' onclick='javascript:SignOut();'>Click here to Sign Out.a>

                    <br />

                    <br />

                td>

            tr>

        table>

    div>

    <div id='divOpacity' style='position: absolute; top: 0; left: 0; z-index: 90; width: 100%;

        height: 1000px; background-color: #A3A5A9; filter: alpha(opacity=60); -moz-opacity: 0.6;

        opacity: 0.6; display: none'>

    div>

IIS Content expiration header and ASP.NET

To increase the performace of application we can set content expiration to




specific folder in iis .Normally we are setting this features to static content in web application (Images)



It gives the lot of advantage .







Steps for setting cache expiration to image folder





-->Start





--> Control Panel



-->Administration tools-->Internet Information Services (IIS) Manager

-->Expand your site from tree view--> Select requred folder

-->go to Features view -->Double click "Http Response Headers"

-->Select "Set common headers link -->prompts a window

-->Check Expire Web Content



-->Select radion button 'After' and in dropdown select the when the content should be expire



-->reset iis using "iisreset" command in command prompt





-->Browse your application

An exception of type 'Microsoft.CommerceServer.Catalog.ValidationException' occurred and was caught Commerce server

This error occurred when catalog name is null or empty 

To fix  This follow these steps 

1.       Find sessionstate tag in  the web.config 

By default it is 20 min increase to 60 min (Depends on requirement )

  timeout=”60”/>

2.       If your maintaining catalog name in session level  .Provide default catalog name if session expire

 Ex :

 public string SessionCatalogName

        {

            get

            {

                if (HttpContext.Current.Session[APConstants.SessionVariables.CatalogName] != null)

                {

                    return HttpContext.Current.Session[APConstants.SessionVariables.CatalogName].ToString();

                }

                else

                {      return APConstants.ApplicationParameters.GKDefaultCatalogName;

                }

            }

            set

            {

                HttpContext.Current.Session[ApConstants.SessionVariables.CatalogName] = value;

            }

        }