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..
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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 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?
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.
This is the strangest problem im facing(may be i missed something). The application works fine locally, but when uploaded on the live server. the session values are not retrieved properly.
i have stored a value in a session in master page's code behind. and afte the page is redirected is to another page, there im not able to retrieve the session value.
why this is hapening.. i remind you this is working perfectly on local server. problem is only when published on live server.
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.
View 8 RepliesI create a class with some atributes.In a web form, I declare a public object like this.Partial Class Intencion
View 7 Repliesi have an asp.net web application.
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When i click button 1, a new list is created. But when i click button 2, it gives me error, saying that its a null list.
The changes i did in Button1_Click() are somehow rolled back. I want to keep the changes.
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 have session variable that is created in EditPlaylist.aspx. Edit.aspx is loading EditPlaylist.aspx in an iframe.
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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.
View 9 RepliesExisting 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.
View 2 RepliesI 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 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.
View 1 RepliesI 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 :
this is the main thread
[Code]....
this is the upload image method :
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and this is a property for the countdown event :
public
CountdownEvent
_3adasehCountDownEvent;
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 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.
asp.net session data lost on postback of the page in windows XP.
View 4 RepliesI'm currently developing a website using VS2010 Express/SQL Express 2008, and am using the applications development server to test.
I have created an access layer which effectively takes all my cachable data and creates datasets.
I've also created a system wheras for each dataset, For each dataset I also create a token cached object (a string), which is set to expire before the dataset. The theory behind this is that when my token expires and is removed from cache, it calls a routine to rebuild the dataset, and re-caches the new result, then creates a new token. Think of it as a poor mans SQL dependency.
What this allows me to do is rebuild datasets behind the scenes with little interruption/delay throughout the day. It all works great - for instance when a user updates a table containing 100,000+ records on the site, the dataset rebuilds at hourly intervals reworking and consolidating the data in the background before representing it in a smaller cachable form.
What I would like to know is this. If I was to replace the database during the usable day (only updating the tables that users don't update), lets say adding 50 new records, would it cause the cache to be dropped. The reason I ask is because it the cache remains until its exipry time, I can replace the database and rebuild datasets incorporating new data in the background when the token expires. If the cache is dropped when I update the database, it will mean interuption whilst I reload the datasets and will change my strategy on uploading new data.
I ask the question because I'm currently working on the development server and unable to test in a live server environment at present.
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>
I'm having problems with the sessions states on my application.When I run the application off my c drive all the session variables are there. Everything works perfectly, nothing is wrong.However, when I publish the site to a server test environment, the session variables disappear. Why is this? Is there a way around this?Here is my codes.for retrieving it. Note, the session.count actually is 0.
[Code]....
for setting the session variables.
[Code]....
In my Application_BeginRequest I have code that gets query string value ?c=FR or ?c=US and store it in cookies.Based on query string value I have either US or FR,locale is selected from locale table.If ?c=FR then locale will be fr-FR and if it is US then locale will be en-US.My code is below.
void Application_BeginRequest(object sender, EventArgs e)
{
LocalizationInfo loc = GetLocalizationInfo();
if (Request.Cookies["Localization"] == null)
Response.Cookies.Add(new HttpCookie("Localization"));
Response.Cookies["Localization"]["Country"] = loc.Country;
CultureInfo objCI = new CultureInfo(loc.Locale);
Thread.CurrentThread.CurrentCulture = objCI;
Thread.CurrentThread.CurrentUICulture = objCI;
}
public static LocalizationInfo GetLocalizationInfo()
{
string countryCode = "";
string sLocale = "";
if (HttpContext.Current.Response.Cookies["Localization"]["Country"] != null)
countryCode = HttpContext.Current.Response.Cookies["Localization"]["Country"];
if (!string.IsNullOrEmpty(HttpContext.Current.Request.QueryString["c"]))
countryCode = HttpContext.Current.Request.QueryString["c"];
if (countryCode == "")
countryCode = "US";
sLocale = HertzRent2Buy.DataProvider.ListData.GetLocale(countryCode);
LocalizationInfo ret = new LocalizationInfo();
ret.Country = countryCode;
ret.Locale = sLocale;
return ret;
}
public struct LocalizationInfo
{
public string Country;
public string Locale;
}
Now when I run the project and in query string I set [URL] then for the very first page(home page itself) it shows me French translation,but on subsequent page,that query string parameter ?c=FR is lost and hence it shows be English translation not French translation since it does not pickup French resx file.If I manually append ?c=FR in subsequent page then it shows the French translation.Is there is way how I can make that query stringparameter available in all pages.Structure is there to hold Country and locale variables. In all pages I am calling GetLocalizationInfo() method as follow
LocalizationInfo info = some.DataProvider.Globalization.GetLocalizationInfo();
And I create instance info to pass locale and country as parameter. GetProductDetails(id,info.Country,info.locale). why my query string parameters get lost on subsequent pages.
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.
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but after that i observe that somehow "Session_Start" event gets called.
am building a asp.net website. Here I want ot use a preloader where diffrent-diffrent will load and work as preloader. These images will load untill full website is not loaded.
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