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POKeeping a related ASP.NET application's session alive from another ASP.NET application
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  1. POKeeping a related ASP.NET application's session alive from another ASP.NET application
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    copied!<p>I have 2 applications running on the same domain. The flow goes like so:</p> <ol> <li><strong>Application 1</strong></li> <li><strong>Application 1</strong> -> <strong>Application 2</strong></li> <li><strong>Application 2</strong> -> <strong>Application 1</strong></li> </ol> <p><strong>Application 1</strong> is WebForms (asp.net framework 2.0), <strong>Application 2</strong> is ASP.NET MVC 3 (framework 4.0)</p> <p>While the user is on <strong>Application 2</strong>, I'd like to keep the session alive on <strong>Application 1</strong>.</p> <p>While building <strong>Application 1</strong>, we built in a "KeepSessionAlive.ashx" handler that simply does Session("KeepSesssionAlive") = DateTime.Now() when requested, as described in <a href="http://www.dotnetcurry.com/ShowArticle.aspx?ID=453&amp;AspxAutoDetectCookieSupport=1" rel="noreferrer">this article</a>. We did this because this is an assessment application and during some of the harder parts of test, a user might need a long time before they choose an answer. Here is the code:</p> <pre><code>Public Class KeepSessionAlive : Implements IHttpHandler, IRequiresSessionState Public Sub ProcessRequest(ByVal context As HttpContext) Implements IHttpHandler.ProcessRequest context.Session("KeepSessionAlive") = DateTime.Now End Sub Public ReadOnly Property IsReusable() As Boolean Implements IHttpHandler.IsReusable Get Return False End Get End Property End Class </code></pre> <p>Then, I simply call this handler periodically within <code>Application 1</code> using jQuery: <code>$.post("KeepSessionAlive.ashx", null, function() { });</code></p> <p>So, I figured I could call that same handler from <strong>Application 2</strong> using $.ajax(), I even looked into using jsonp, but this doesn't seem to be working. I wrote code to log all the session variables from KeepSessionAlive.ashx to a file, and even to return stuff via jsonp response, and the data looked right.</p> <p>However, doing a test in which I lingered in <strong>Application 2</strong> long enough for <strong>Application 1</strong>'s session to expire and then trying to do the transition from <strong>Application 1</strong> -> <strong>Application 2</strong>, when I reach the return page in <strong>Application 1</strong> I'm greeted with an <code>System.NullReferenceException: Object reference not set to an instance of an object.</code> error because I'm trying to reference one of the objects in Session. The only value in session is Session("KeepSessionAlive"). I assume this is because it created a new session, but if that's the case, why were my tests that logged the session values showing all of <strong>Application 1</strong>'s session variables? </p> <p>Are there any other methods I can use to keep <strong>Application 1</strong>'s Session alive while the user is filling out the forms in <strong>Application 2</strong>?</p>
 

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