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POsession variable becoming null after some time
 

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    <p>I have developed a web application which will perform slideshow of some images.I have jquery ajax web method call for this application</p> <p>The images are rolling perfectly...But after some time it is stopping...I found out from logs that my session variable(here Session["Username"]) is becomming null.My code is</p> <pre><code> [WebMethod] [ScriptMethod] public static string GetNextImage() { try { if (HttpContext.Current.Session["Username"] != null) { string username = HttpContext.Current.Session["Username"].ToString(); RollingScreenBAL bal = new RollingScreenBAL(); DetailsForSlideShow[] details = bal.GetDetailsForSlideShow(username); int count = details.Length; int i; for (i = 0; i &lt; count; i++) { if (HttpContext.Current.Session["Count"] == null) { HttpContext.Current.Session["GraphUrl"] = details[0].GraphUrl; HttpContext.Current.Session["Count"] = i + 1; break; } else { if (Convert.ToInt32(HttpContext.Current.Session["Count"]) == i) { HttpContext.Current.Session["GraphUrl"] = details[i].GraphUrl; if (i == (count - 1)) { HttpContext.Current.Session["Count"] = null; } else { HttpContext.Current.Session["Count"] = i + 1; } break; } } } } return HttpContext.Current.Session["GraphUrl"].ToString(); } catch (Exception ex) { ConfigurationManager configMgr = new ConfigurationManager(); string traceFilePath = configMgr.GetTraceFilePath(); StreamWriter traceFile = new StreamWriter(traceFilePath, true); traceFile.WriteLine(ex.Message + "\n" + ex.StackTrace + "Current User is " + **HttpContext.Current.Session["Username"])**; traceFile.Close(); return ex.Message; } } </code></pre> <p>HttpContext.Current.Session["Username"]) session value is becoming null..Can anyone please help me why it is going null? Thanks in advance...</p>
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