State Management :: Losing Session Data With Response.Redirect?
Oct 25, 2010
This is weird. In my newly developed chat application, when I invoke Response.Redirect, I am losing my session data. What is particualrly odd is that this sometimes seems to occur after a slight delay, so I reach the page, and then the session info gets lost momentarily thereafter. Mostly though it seems to get lost immediately. I have of course googled this issue, but yet to find anything that speaks to my problem. SessionState is in InProc mode. Session state has been working fine for me until this unexpected problem, so everything is configured right. So far the only workaround I can think of is to use a link instead of a button, and use javascript to call a server-side function on onclick to do the work I need to do before the link gets invoked. Messy, and I'd rather not go that way unless there's no alternative.
Just to preempt one red herring, I do use Response.Redirect(<address>, false).
The problem occurs both on the testing and production servers. I'm running ASP.NET 3.5 on IIS7.
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Jan 4, 2011
I have an issue of losing an InProc session variable when I call Response.redirect. I have seen a number of posts related to this, but haven't found a solution. My code is essentially:
Session("MyVariable") = "SomeBoolean"
Response.Redirect("NewUrl.aspx", false)
When I try to read Session("MyVariable") on the NewUrl.aspx page, it doesn't exists.
What's odd is that this doesn't typically happen in my local environemnt, but hapens quite often, if not all the time, on the shared server this application resides on. I saw some info about web farms and load balancing which could cause an issue. I am fairly certain this app is not part of a web farm.
A little background, in case there is a better method than using Session State...
I have created the ability for an administrator of this applicationto log in as any other user using a "Skeleton Key" password. When the admin does this, I store a boolean in session which refers to the fact that they are logged in and "Impersonating' another user. This gives the admin additional access that the user would not normally have. Anyhow, that is why I store a sessoin variable.
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Aug 17, 2010
is it possible to create a new Session Id using C# and without using a Response.Redirect(...Page ... ). I want to create a new session Id on page load.
Reasons for doing so:
I have a testing application that creates IFrames to act as users. the problem I have is that with Multiple Instances (or Multiple IFrames running the same application "Default.aspx") all IFrame's are using the Same Session ID. I have variables stored in the Session ID that I need to be seperated from IFrame to IFrame. Ex:
IFrame 1 gets passed a query string of a client ID "1"
IFrame 2 gets passed a query string of client ID "2"
WHen the IFrame 2 gets loaded the session state of IFrame 1 inherits the IFrame 2's session's making the Client ID in Session 1 = "2". See what I am getting at?
I want to be able to have each IFrame create its own Session State. I guess there is 2 questions to this, 1.) is it possible to create a new Session State by abandoning the original and by doing so will that abandon both session ID's and just create an ID for both IFrames being the same ID? 2.) How can I do this if it is possible :-)
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Feb 2, 2011
I am trying to set a session variable in the global.asax file and keep running into the problem that the Session is null.
I am running my application in VS2008 and using asp.net 3.51.
Here is my code:
1. In my web.config file I have enabled the session state and added the following line;
<sessionState
cookieless="false"
mode="InProc"
timeout="60"
></sessionState>
2. In the Session_Start procedure in the Global.asax file I set the session variable to a default value.
[Code]....
My problem seems to be that when the Application_Error procedure is executed the session state is lost.
Does anyone know why the session state isn't available in the Global.asax file.
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May 10, 2010
I have a asp.net application where I am saving off into session the user privilege information. From a grid I am bring up a new window by using the window.open. It seems that it is whiping out the values in session. A temporary bandaid I have placed on it is to recall the database if the value is nothing to reset the user object. I have found all over the internet that this is an issue with the window.open in IE 7 and IE 8. Has anyone else run into this and able to actually fix it?
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Mar 14, 2011
There are a couple of user's experiences session variable loss after they've clicked a confirm button and their information is email via a relay hosting server. Below, I commented exactly where the session variables get lost.
What could be causing the session variable loss? So far, this only happens to a few users.
Part of the email that gets sent out:
[Code]....
Web config file:
[Code]....
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Jan 25, 2011
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.
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Jul 6, 2010
Our project contains the folder structure. when I redirect to page in different folder, session automaticaly ends. How can I prevent this?
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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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Jan 7, 2011
i have a website and i know that the session expires and it gives me instance of object not set error.
I have a masterpage could i do it in there on page_load?
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Sep 20, 2010
I am creating web application. In that I want to set session timeout (not idle timeout). If a user logged in that time the session time will start and it automatically should detect session timeout the page should redirect to another page. How can I acheive this.
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Oct 25, 2010
If a normal session timeout occurs we could handle the session timeout.
But say we are using a lot of ajax calls, webhandlers etc. How would we catch session timeout here and redirect to error/login page.
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Feb 21, 2011
I'm using sessions to track user name. I assign Session["userName"] in my login procedure. The sessionn gets timeout in about 15 minutes. What I need to do is, if the session timeouts I need to redirect the page to the Default.aspx page.
How can I do this? Any code example would be great.
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May 17, 2010
We have a web app running .net 1.1 that users must login to access (uses FormsAuthentication). At one point, the user submits a form that is handled by a separate web app on the same website but in a different directory (running .net 2.0 and not requiring authentication). When the user submits the form and is redirected to this other page they have some options including returning to the previous web app.
We need our users to stay logged in to the first web app so they do not have to log in again when returning. This works fine on 3 out of four computers, but the fourth computer is asked to log in when they hit the return button (by reviewing the active cookies we see that when it returns to the original web app, the FormsAuthentication cookie is missing)
why this cookie would disappear on one machine but not the others? I am going through IE settings now but the machine has the problem in IE and Chrome (not sure if this would be a shared setting) If it is an IE setting is there a way to make this work without requiring the user to change their settings and without switching to cookieless sessions?
Here is the authentication part of web.config
[Code]....
And if it makes a difference, the redirect and form action property use a the full path, would using a relative path likely change anything?
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Mar 27, 2010
I am in beginner level on developing web pages. I was coding on desktop applications and as you know it is easy to say that web applications are extremely different than desktop applications.
I wonder why data are lost between postbacks.???? And what is the best way not to lose the data belonging to a specific control (especially gridview). Session or viewstate or anything else?
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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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Jan 8, 2010
I have one website in which there is one page along with one ascx as registered into it. In the ascx where user can add some order details and click on "Make Payment" button, then there are following 2 cases...Case I: If user was not logged in, then a modal popup will open which has login ascx with 2 buttons Register & Login. In this case user either Login or Register and continue with "Make Payment".
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May 13, 2010
I have two radio button list:
*1* report views -- 4 options -- NOT in updatepanel
*2* pagination views -- 2 options -- IS in updatepanel
The situation goes as follows: Refresh WORKS in default setting but when I select *2* radio button options and refresh the page renders the state that the (1) was entered in.
Example: () are the radio buttons
Report Viewing: () (x) () () Pagination View: (x) () REFRESH works!
Report Viewing: () (x) () () Pagination View: () (x) REFRESH fails to display Report Viewing: () (x) () () Pagination View: (x) ()
Report Viewing: () (x) () () Pagination View: (x) () REFRESH works!
OR: () are the radio buttons
Report Viewing: () () (x) () Pagination View: () (x) REFRESH works
Report Viewing: () () (x) () Pagination View: (x) () REFRESH fails to display Report Viewing: () (x) () () Pagination View: () (x)
Report Viewing: () () (x) () Pagination View: () (x) REFRESH works
I am using the session variable to hold the Pagination Viewing option but during page states, I've noticed that when a 2nd option is selected of *2* radio buttons (doesn't matter of 1st or 2nd option was initially selected) that during debugging mode the step over corrects the issue but not the right table viewing. Upon entering Page_Init selection selection index of radio button list returns to 1st option.
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Apr 8, 2010
i have created a multilanguage site that uses culture to change from one language to another.
the problem is that when i am going from one page to another the varriable session("myCulture") is empty.
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Mar 14, 2011
OS: Windows 7
VS: VS 2010 Pro SP1 - IIS Express
I am debugging my project, the first page is a login page which I login and I can see from debug that the session is being set, after the redirect to the homepage the session seems to be lost and I am taken back to the login page.
If I run outside of VS on our sandbox or production server the login works fine. It only seems to be my machine w/ VS that does not like the sessions.
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Dec 13, 2010
Never had this happen before. I just upgraded my site from 3.5 to 4.0. Here's the scenario:
1.) I have a literal on a web form, in an UpdatePanel.
2.) On PostBack, the Literal's "Text" property loses it's value. The ViewState is enabled throughout the page. Further, I changed the Literal to a label and it also has this problem. The TextBox's appear to keep their values.
3.) If I remove all of the Ajax controls (which currently is just the UpdatePanel and the ScriptManager) then the Literal control keeps it's value through PostBacks.
4.) There is no client side JavaScript where I'm manually changing the values of these controls. They are only editted in the server side events.
I have read that setting the AutomaticDataBind property in the web.config could remedy this but I can't find any documentation on it and I don't know where to put it in the web.config to even try it.
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Dec 28, 2010
I'm fairly new to ASP.net development as may have been noticed by some of my other posts and so here goes another one.I have a web page in which I allow users to enter data that will be used to populate a database and then graph data based on the information that was saved in the database. I have 10 sets of criteria that the user can enter and as they enter values for each individual set, I make sure all the parameters are filled in and set a variable called blnParm1, blnParm2, blnParm3, etc. Anyway, as each DropDownList box fires off an event the values of my blnParm variables is reset because each time the event is fired the page is PostBack therefore my variables are redeclared. I know the page is being PostBack because each of the DropDownList boxes have AutoPostBack set to true. I had to do this so that I could get the OnSelectedIndexChanged event to fire for each of the DropDownList boxes. So, how do I preserve my variables through this PostBack or how do I get the events to trigger without calling AutoPostBack?
Some more info, my variables are declared globally in my aspx.cs file as private bool. The code is working like it should as far as populating drop downs dynamically based on other data input by the user, the controls all have their values preserved as the page is PostBack.
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Sep 18, 2010
We have a scenario where we need to store large tables of data on Session in asp.net page. on a highlevel we have to store following data
1> A table (table 1) with 1000 rows and 8 to 10 columns.
2> A table(table 2) with 500 rows and 8 to 10 columns (actually user can add the data from table 1 to table 2, so as user keeps on adding from table 1 we remove the data and put it in table 2)
3> Another table(table 3) with 1000-1200 rows each having 3 columns.
We are having a webfarm, so we need to store it in either SateServer of Oracle DB,What would be the performance implications of storing such huge data on the server.
One more thing is at any point of time max of 70 -80 people will be accessing our website, so will this cause any performance degradation?
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Nov 11, 2010
I hope somebody can guide me to overcome below challenge.
My form has three dropdownlist controls and one listview. Everything works fine if I don't try to pass multiple querystrings to get different URL on the same page. But challenge comes when I try to pass multiple querystrings to show different URL's for SEO.
Following are the ID's:
1. DropDownList1= Country
2. DropDownList2= State
3. DropDownList3= City
4. Listview1= Resturants (I am not including Code .....yet)
With my code DropDownList1 holds the state and passes the value to URL OK .When I try to select
different value in DropDownList2 or DropDownList3 are able to
pass the vaule to URL but in the form they stay on the first item and doesn't change and so does Listview1.
Here is my code:
<%@ Page Language="C#" AutoEventWireup="true" %>
<%@ Import Namespace="System.Data" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<script runat="server">
protected void Page_Load(object sender, EventArgs e)
{
if (false == IsPostBack)
{
if (Request.QueryString["Brand"]!= null)
{DropDownList1.SelectedValue = Request.QueryString["Country"].ToString();}
if (Request.QueryString["Gender"]!= null)
{DropDownList2.SelectedValue = Request.QueryString["State"].ToString();}
if (Request.QueryString["Category"]!= null)
{DropDownList3.SelectedValue = Request.QueryString["City"].ToString();}
}
}
protected void DropDownList_SelectedIndexChanged(object sender, EventArgs e)
{
Response.Redirect("/resturants.aspx?State=" + DropDownList1.SelectedValue + "&State=" + DropDownList2.SelectedValue + "&City=" + DropDownList3.SelectedValue);
}
</script>
<head></head>
<body><form id="form1" runat="server">
<asp:DropDownList id="DropDownList1" runat="server" AutoPostBack="True" DataSourceID="AccessDataSource2" DataTextField="Country" DataValueField="Country" ForeColor="#808080" OnSelectedIndexChanged="DropDownList_SelectedIndexChanged" >
</asp:DropDownList>
<asp:AccessDataSource ID="AccessDataSource2" runat="server" DataFile="../database.mdb" SelectCommand="SELECT DISTINCT [Country] FROM [Country] ORDER BY [Country]">
</asp:AccessDataSource>
<asp:DropDownList id="DropDownList2" runat="server" AutoPostBack="True" DataSourceID="AccessDataSource3" DataTextField="State" DataValueField="State" ForeColor="#808080" OnSelectedIndexChanged="DropDownList_SelectedIndexChanged" >
</asp:DropDownList>
<asp:AccessDataSource ID="AccessDataSource3" runat="server" DataFile="../database.mdb" SelectCommand="SELECT DISTINCT [State] FROM [table] WHERE ([Restuarant NAME] LIKE '%' + ? + '%')">
<SelectParameters>
<asp:controlparameter ControlID="DropDownList1" Name="Restuarant_NAME]" PropertyName="SelectedValue" Type="String" />
</SelectParameters>
</asp:AccessDataSource>
<asp:DropDownList id="DropDownList3" runat="server" AutoPostBack="True" DataSourceID="AccessDataSource4" DataTextField="City" DataValueField="City" ForeColor="#808080" OnSelectedIndexChanged="DropDownList_SelectedIndexChanged" >
</asp:DropDownList>
<asp:AccessDataSource ID="AccessDataSource4" runat="server" DataFile="../database.mdb" SelectCommand="SELECT DISTINCT [City] FROM [table] WHERE (([State] = ?) AND ([Resturant NAME] LIKE '%' + ? + '%'))">
<SelectParameters>
<asp:controlparameter ControlID="DropDownList2" Name="State" PropertyName="SelectedValue" Type="String" />
<asp:controlparameter ControlID="DropDownList1" Name="Resturant_NAME" PropertyName="SelectedValue" Type="String" />
</SelectParameters>
</asp:AccessDataSource>
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Oct 7, 2010
I want to be able to persist data across a session but do this outside of the built-in session state object. Why is a long story that I will not go into here. I just need to know where I can put data other than in the session object that will persist across the specific session.
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