State Management :: Session Lost When Multithreading Though ( There Is A Wait Call ! )?
Mar 9, 2011
I am creating a multithreading application and I am using countdownevent to signal my object arround 3 times and using wait , but somehow the session goes null , although I am setting a breakpoint after mycountdownevent.wait() and the breakpoint isnt reached , that means the execution is not done...so can someone tell me what is wrong?? here is my code :
I'm not sure if this is an error or is the right work mode for sql sessions.
I'm working now with Windows 2008 R2 Web Ed. and SQL Server 2008 Web Ed.
When I close my browse and open again a new browser window I need to login again in asp.net application and a new session is created in the sessions table in sql server.
It's this normal? I remember that with Windows 2003 and SQL 2005 this doesn't happend. When I closed my browser and open inmediately a new browser window my session was retained and I could continue working without relogin.
I need to make my asp.net session cookie as secure but whenever i check user authentication and after that i am trying to set cookie to true then my session lost my user information and so it always redirect login page. I am settings user to HttpContext.Current.Session["user"] and check every time, is user is valid and if valid then move ahead. but before that i make my asp.net session cookie as true.
[Code]....
but after that i observe that somehow "Session_Start" event gets called.
I am working on an asp.net website using C#. The site deals with orders and therefore order lines. I would like to store the order in memory whilst it is being populated (with order lines) and once it gets submitted write it to a database.
The above logic has been implemented, but sometimes when accessing session state or storing a variable in it information gets lost. Take note that the web server is running a dual-core processor. I am also using the in proc session state server.
I tried changing over to using the out proc session state server (asp.net state service), but it requires serialization. Since the order and orderlines are actually linq to sql classes, the entitysets and entityref's fail to serialize.
Does anyone know the reason why session state loses information occasionally and possibly how to eliminate the problem?
I have a problem with a couple of web sites where my session state gets lost prematurely.
I use the Inproc session provider and Asp.net 2.0. Which of these are true:
The antivirus software disturbs the session. IIS recycles the app pool every 2 hours and it does not retain the sessions during a recycle. Index server disturbs the session. Anything else that can have disturbed the session?
I am using Session ID Manager in all the pages of the website, but I am losing session variables in between the pages. what should I do to save the values of session variables. Anoop
I am using Windows xp/ .net 2.0 / vs 2005 for development environment. My session data (not all session data) are getting lost when I try to navigate between pages through window.open but the same is working perfectly in proc mode but in state server / sql server mode I am facing the problem.
Existing applications works fine with IE 6 and 7, the problem occurs only with IE 8. A new session is created everytime a window.open is used to open a new asp page. This does not happen in IE 6 or 7.
I need to run a exe file in server. I use proccess.start to do this. When the process.start finish then the session is lose and I lose the user with I login.
I am creating a presentation on basis of some selected values and maitaning the selected values in a session variable named Session("userPref") in collection form.
Now I am opening a TablePreview.aspx page by javascript window.open() function.
On Page_Load of TablePreview.aspx I am reading some values of Session("userPref") and doing some operatons.
For saving the presentation I have created a page wizardsave.aspx.
Now I am opening the wizardsave.aspx from TablePreview.aspx by window.open() function for saving presentation, but on Page_Load of wizardsave.aspx. I found that some value from collection stored in Session("userPref") have lost.
In my webapp page i load a custom user control, this uc loads data from an xml file in a JSGrid. All this works fine and uses callbacks. The uc is the callbackhandler and thus implements the icallbackhandler interface. Now, i gave this uc some properties, like the path to the xml file. After each callback the uc loses the values of its properties. Currently i'm including the path in each callback itself so i can load the file each time i need it, but this isn't the good way i think.
I tried solving this with viewstate but it doesn't work, a callback also seems to erase the values of the viewstate.
Is there a way to keep these values stored in the uc instance? Maybe a way to disable the erasing for each callback?
Also each callback contains "Changes", this has al the changes that were made to the grid. So when all the changes were made in the grid, i want to get these changes in my page that contains the uc in order to decide ther what to do with this data.
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 ?
I have 2 front end servers and 2 back end servers. There is a registration form in my web application. The registration form uses a Microsoft Wizard control. Lets say the Wizard control has 4 steps. After the fourth step, users click "Finish" and I display the "Thank you Message". The way the request is routed between the 2 servers is round robin. So lets say till the fourth step, the response comes from server A. After the user clicks "Finish", lets say the response now comes from server B. After they click "Finish", I am trying to access some information in the Wizard control (like Name, address and so on). Because the servers are now switched, the data is lost (at least thats what I think is happening). So all entries in the wizard control are now blank and when I try to read those values, they are null.
Now i have faced some strange problem.I have added an arralist into session.And then accept it from another page .Every thing is work fine when locally(visual web developer).But when uploaded most of time error occured "System.NullReferenceException: Object reference not set to an instance of an object.".why?pls help me..
I have an asp.net login page, which when initialized sets some session variables. When the user clicks login, an AJAX request is made which validates the user and sets additional session variables and returns a result to the client. The client is then redirected based on the login result. In the redirected page, I can access the session variables set when the login page was initialized (i.e. before the login) but none are present for those set during the login validation (part of an ajax call).
is this expected behaviour? Why would an ajax call generate a new session and thus cause the data to be lost?
I have a session state that myself and others on my team have been bashing our heads against the wall for the past week. We have tracked it down to the following:
1) Frame page containing content pages creates a session
2) Content page creates a session, stores data in the session
3) User changes drop down list with SelectedIndexChanged autopost back and displayed fields are changed using an UpdatePanel. A new session is created, data stored in the prev. session is lost 4) User posts back, no session is created this time, however the post back fails because the session from step 2 is lost.
Now, a user closes the page, comes back, and it actually starts to work:
1) Frame page containing content page opens (no new session)
2) Content page loads data, stores in session (no new session)
3) User changes drop down list with SelectedIndexChanged auto postback and displayed fields are changed using an UpdatePanel. Sesson NOT lost
4) User posts back form, success
ASP.NET on the first visit to the site insists on creating 3 sessions, we log it in Session_Start. I can't think of any reason this should happen. I've been told the frame will always be on a seperate session; thats fine, its only being used to setup scrolling within a frame in Dynamics CRM. The biggest question is why when we insert data into the session in step #2, it is discarded in step #3.... but only during the first visit to the page!
I've never seen this session behavior before; we don't have any session abandonments in our code, and we never clear session objects, so there shouldn't be any reason for the session to be lost.
I have a web form with a whole bunch of drop down lists (mainly) that works perfectly well and has been for some time. However, we've found a scenario that seems to corrupt the viewstate of this form in someway, or cause it to lose it's viewstate. The problem occurs when the user has this form displayed, then clicks on a link that opens up another window. A few more steps to open up a second and third window, followed by a write to the database. Then the user closes these windows down, leaving this original window open. At this point, the user selects something from one of the dropdowns. And the app crashes because the dropdowns have lost all of their values (and so a bit of code that is trying to work with one of the ddl's selectedvalues fails).
When the user selects this dropdown, the page_init event fires, followed by the page_load with postback = true. The dropdowns themselves are defined in the aspx page markup, but the values of them are generated and added in page_load (where postback = false). I've relocated the code to populate these controls to the page_init code and now the app doesn't fall over, because the values are re-populated. However, all of the selectedindexes are being reset, so the original values are lost and the screen redraws after this postback with all of the dropdowns reset.
i have one method which save datatable in viewstate.i am calling this method in. page_load2. Prerenderthe page was every heavy,i did tracing of page i found due to calling of method from preprnder it doubled the viewstate sizewhat was the reseon behind this.
I have a simple search page with a drop down list that I would like the value to persist on refresh..basically the user will select their location from the dropdownlist and this will be used to populate a gridview. After this the page is set to refresh at a set interval and use the same location data initially selected by the user. However the initial selection is lost each time the page refreshes.
p.s system is to old for ajax!
<meta http-equiv="Refresh" content="300" /> <script runat="server"> Dim connectionString As String = ConfigurationManager.ConnectionStrings("****").ConnectionString Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) If Not IsPostBack Then Dim conn As SqlConnection conn = New SqlConnection(connectionString) Dim Locationcommandtext As String Locationcommandtext = "SELECT * FROM [Location] ORDER BY [Location]" Dim loccomm As SqlCommand loccomm = New SqlCommand(Locationcommandtext, conn) Dim reader As SqlDataReader Try conn.Open() reader = loccomm.ExecuteReader() Locations.DataSource = reader Locations.DataValueField = "LocationID" Locations.DataTextField = "Location" Locations.DataBind() Catch ex As SqlException Response.Write("SQL Error: " & ex.ToString()) Finally conn.Close() End Try Else '"Viewstate should kick in here" End If End Sub </script>
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.
