State Management :: Session Suddenly Become Null - Need To Rebuild
Jul 28, 2010
I have a strange problem with the session. I have global.asax with code in the session_start event. This code calls some code that I have in a helper class. When I first run the project in debug everything is fine. However when I stop debugging and then re-run the project it fails and I have discovered that once the code in the helper class is hit the session is null. If I look in the global.asax session_start code the session is instantiated before it enters the helper class. If I then re-build the project and the re-run it everything works fine again! Why does the session suddenly become null and why does a re-build fix the problem?
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Aug 10, 2010
I have a web application that was working fine. I had to make minor changes that had nothing to do with the Session object in any way. When I run local everything works fine. When I publish to our testing box it all runs fine. When I publish to production it times out on the Session object. Dozens of other applications on the production server run fine and have no trouble with Session.
It does not matter if the line is:
Session("PreferredName") = sPreferredName
or:
sPreferredName = Session("PreferredName")
I had the server admin remove the application pool and directory and recreate them and then I republished and it still happens.
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Apr 29, 2010
I have a clear button and a textbox in an aspx page. I set the session variable in this page as
String str = Textbox1.Text;
Session["TypeIds"] = str;
and I clear the sessions in a clear button event as
Session["TypeIds"]=null;.
Then when the user types some value in the textbox ,on Response.Redirect on another aspx page, the session variable returns null values.It does not retain its session state. The session state has to be maintained in the next page. Is it because this clear button event and setting explicitly to null creates this problem?
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Nov 8, 2010
On my development machine, the session state data is retained after a post back to the server. (XP VS 2008) (This is true if running from within VS or if running in browser with localhost.)On the deployed test server, the session state is blank in IE, but works in Firefox. (Svr 2003 IIS 6)Both machines are running the exact same code with the exact same imputs and same web.config. There is no code between the post backs that write to the session state.Newest addition to the server would be the consumption of a WCF web service. Could this be a symptom of something missing on the server(s) when trying to connect with WCF? I could not find any information other than installing the 3.0 framework. I have 3.5 SP1 installed on the test server.
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Feb 17, 2010
I have an app that worked perfectly in development (Visual Studio 2008 Dev Server/Vista), was setup to use cookieless sessions in the web.config, which worked fine. Now rolled out into production (win2003/IIS6) configured as a Virtual Directory. But I'm having Null session issues after a button click. The problem doesnt persist in FF but in IE8. I tried to change session state to cookies and cookieless (InProc) with no go.
[Code]....
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Jan 15, 2011
I am having session null on url routing , I searched the net all solutions are mostly for asp.net 3.5 , am using 4.0.... i dont have modules tag in web.config , i've got httpmodules which doesnt have that property.
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Jul 30, 2010
In certain pages when i try to rediect to a perticular page the Session automaically gets assigned to null, have no idea why is this happening.-No where I'm using Session.Remove or Session.RemoveAll.-Also not even using EnableSessionState="true" or "false" as by default it will always be true, I know...
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May 24, 2010
At the login page i m using
adminlogin.aspx
Session["Admin"] = txtUserName.Text;
response.redirect("admindefault.aspx");
[code]...
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Aug 17, 2010
I have a requirement where i need to download mutiple files as a single zip file.There is linkbutton named HOME as well in the page. when this linkbutton is clicked it should redirect to homepage.aspx. I found a ICSharpCode.SharpZipLib.dll in net and used in my website. Here is the code
[Code]....
With the above code i got the expected result i,e. i can zip the files and save on client system. But the problem is after saving/canceling the zip file if user clicks on linkbutton in the page_load event Session[getdata] became null. there is no data in Session. what might be the problem? Actually it should redirect to homepage.aspx but its going to login.aspx because Session[getdata] is null.
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Jan 27, 2011
I have a Authorizeclient.aspx.cs page where I set my session value.Authorizeclient.aspx is a blank page. HttpContext.Current.Session["nodeID"]="0". This session value changes from 0 or non zero which depends on the value returned by Database. If no value is returned I assign HttpContext.Current.Session["nodeID"]="0" as the default state else I assign HttpContext.Current.Session["nodeID"]=resolve(nodeID).ToString()
Till this part it works fine as expected. However, I have a requirement that I need to read the nodeID from Session in other application on the same server. I mean this application too is part of the root project where I initially created the Session and set it. The strange thing is the Session["nodeID"] in application gets null "SOMETIMES" Not always. I am trying to read the Session in Page_Load. Sometimes it works fine and sometimes it gets null. Moreover the session object do not die and I can see other keys like Session["Themes"] etc there. The session is in InProc mode and have 20 minutes timeout time.
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Jan 30, 2011
I have a "one page application" (ASP.NET 3.5, VS 2008, IE7) that uses Default.aspx as it's page, and holds an iFrame within "floating panel" (asp:Panel with extenders).
As the desired behavior is to allow users to reopen the application by refreshing the page,
I added this to the Default.aspx.cs:
protected override void OnPreInit(EventArgs e)
{
if (!IsCallback && !IsPostBack)
{
Session.RemoveAll();
GeoApplication.DAL pDAL = new GeoApplication.DAL();
Session["DALinstance"] = pDAL;
}
}
However, when the iFrame page lifecycle starts, the Session["DALinstance"] parameter is null. I've tried to put some additional parameters and those were null as well.
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Aug 4, 2010
I have logged in to the application and naviagate to Resource Editor page where it allows user to enter the value and saves to the resource file of the application.
After user clicks save button and navigate to different page the session value becomes null.
If the user navigate to different page without clicking save the session variable has its value
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Jun 10, 2010
Im trying to use code provide in this link below.http://www.codeproject.com/KB/aspnet/MultipleTabWindows.aspxim trying to have the below code in my master page instead of adding to each page. it works if i add to each page, but when i add to ,master page the session value for "WindowName" is always null.how can i fix this?
<script language="javascript" type="text/javascript">if(window.name != "<%=GetWindowName()%>"){ window.name = "invalidAccess"; window.open("InvalidAccess.aspx", "_self");}</script>public string GetWindowName(){ return Session["WindowName"].ToString();}
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May 5, 2010
I want to use session in thread class but it return null in parent that is the page class.
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Dec 16, 2010
In my application, session value automatically set into null.In certain workflow only it will set as null (Normally It's able to access value). Example, at the time of login, I will set session values. While, user deleting some entries from drop down list of specifc page,client script will show message like selected entry deleted. After that, flow point will move to master page. There I have to access session variables. It's getting null value. I tried to debug with Quick watch, at the pageload of master page only value set into null (automatically).
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Mar 30, 2010
Can anyone explain to me why this first example works fine but the second, which would use a little less code and in my mind appears to achieve the same result, yet throws a null ref error?
This works ...
if (Session["sid"] == null || Session["sid"].ToString() == "")
{
// session is NOT valid.
}
else
{
// session is valid.
}
This does not work?
if (String.IsNullOrEmpty(Session["sid"].ToString()))
{
// session is NOT valid.
}
else
{
// session is valid.
}
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Jun 4, 2010
Ive created an object and placed it in the session, then in my .ashx handler I want to get that object from the session. The problem is that its always null !
heres how ive placed the object into the session from an aspx page
[Code]....
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Jun 15, 2010
I need to refresh my webpage in case of a change in the system time. However I see that my session variables are becoming null when the system time changes. So I cannot perform the refresh action since my webpage requests a login.I am not setting the Session variables to null explicitly anywhere in the code. I can't seem to figure out how they are becoming null.
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May 20, 2010
1. SetSession.aspx page sets value for a session variable and redirects to default.aspx page using Response.redirect() code.
2. Default.aspx page tries to create an object of class in app_codecommon.cs file.
3. In app_codeCommon.cs file, I am trying to access the session variable set in step1 using HttpContext.Current.Session object.
but step 3 gives error that object reference not set to an instance. as HttpContext.Current.Session is null.
I surf abt it on net, and seems to be problem with asp.net framework.
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Sep 7, 2010
i have 2 page,
1.login.aspx --- 2.welcome.aspx
in my login.aspx im storing username into sesssion as below:
Session["usernm"] = txtUsername.Text;
in my welcome.aspx page
in page_load event
if (Session["usernm"]==null)
{
Response.Redirect("Login.aspx");
}
here if i manulally paste the url ( http://localhost:4125/Loginado/welcome.aspx) it should go to login.aspx for user credentials
but its going directly to welcome.aspx page.
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May 20, 2010
I'm doing nothing special with session...
I just put some value on button_click event handler and then redirect to another page
like this { Session["key"]="value"; Responde.Redirect("AnotherPage.aspx"); }
And then I try to read Session["key"] on Page_Load of AnotherPage.aspx but it's null!
What can cause this?
P.S. When I use Server.Transfer() instead of Response.Redirect() it works fine.
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Nov 18, 2010
I read the solutioin for this error, at the following link :http://forums.asp.net/p/1046935/1576341.aspxbut I am still not clear what exactly causes the error. I have two doubts :1. Can anyone please elaborate a bit on this issue, with any example ????2. Is there any drawback of this approach ?
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Nov 5, 2010
Customer were getting "View State Validation Error" due to worker process recycling at our production webserver and to fix that i applied machinekey and then move my Session state Mode from In Proc to State Server to retain session data and not kick out the customer to relogin. I had serialization issue with one object which has to be stored in session but when i moved it out of session i could able to resolve the issue.
But doing all these i was partly successfull in keeping the user in their session when Worker Process recycle event occurs.I was able to refresh the page or make a post back by clicking the refresh button and also able to retain the session values. But the Problem occurs when sending asynchronous request to server which we do periodically every 15 minutes from the moment the user logs in.The web page doesnot update data on website when sending asynchronous request.By Debugging I found at this particular code point it fails to make a postback which is required.
<%=GetHintFromServer%> (When there is no Worker Process recycle i t gets replaced by
WebForm_DoCallback('__Page',message,ShowHint,null,null,false) on postback) Everything works fine when there is no Worker Process Recyling but when it happens looks like sending request asynchronously using javascript fails .Remember When I make a post back by manually clicking submit button everything works fine.
SendRequest(Asynchronous)
function SendRequest(msg, isBusy, chartMsg, vesselMsg)
{
try
{
//confirm("msg"+msg+"isBusy"+isBusy+"chartMsg"+chartMsg+"VesselMsg"+vesselMsg);
_busy = isBusy;
if(chartMsg != null)
{
//confirm("chartMsg"+chartMsg);
_element.SetMessage(true, chartMsg);
}
if(vesselMsg != null)
{
confirm("chartMsg"+vesselMsg);
_element.ShowVesselLoading(true, vesselMsg);
}
_stuckWatchdog = setTimeout( "ClearPendingRequest();", 60000);
var message = msg;
var context = '';
<%=GetHintFromServer%>
}
catch(e)
{
alert( "Exception error on SendRequest(): " + e);
}
}
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Dec 12, 2010
I am new to .net 4.0 and am using EF Model and SessionState Mode=SqlServer and I am getting this error below:
Unable to serialize the session state. In 'StateServer' and 'SQLServer' mode, ASP.NET will serialize the session state objects, and as a result non-serializable objects or MarshalByRef objects are not permitted. The same restriction applies if similar serialization is done by the custom session state store in 'Custom' mode.
I checked the stack trace and its complaining about
[assembly: global::System.Data.Objects.DataClasses.EdmSchemaAttribute()]
[assembly: global::System.Data.Objects.DataClasses.EdmRelationshipAttribute("PoplarGroveModel", "tblMenuRole", "tblMenu", global::System.Data.Metadata.Edm.RelationshipMultiplicity.Many, typeof(PoplarGroveDataModel.Menu), "tblRole",
[Code].....
I marked it as serializable but then it complains about System.Data.Objects.ObjectContext is not marked as serializable and hence throws the same error.
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Apr 5, 2010
Our ASP.NET App uses ASP State Session Management and has been rebuilt about 2 years ago [With .NET Framework 2.0]. We are currently in .NET framework 3.5 and have moved to SQL Server 2008 - but continue to use the same ASPState database. The State database has been upgraded to SQL Server 2008. Since then we have are seeing timouts/locks on ASPStateTempSessions table. I am wondering if we have to rebuild this database from scratch with some newer scripts?
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