State Management :: Accessing Session State In A User Control?
Sep 1, 2010
We have a web site that implements a custom SiteMapProvider using a User Control added in the master page. I need to be able to limit the sitemap nodes added depending on the logged in user, that is, certain users should not see certain sitemap nodes. Currently, the login processing code determines if users are in the certain category or role and then sets a value in session state, for example, Session["UserInRoleXXX"] = "Yes"; I tried changing the code in the user control to check the session state, but I got the following error: NullReferenceException ... Object reference not set to an instance of an object." Can session state be accessed in a user control?
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Similar Messages:
May 21, 2010
I've searched these forums, found some pretty similar problems, but haven't found solution to the following:
I'm using simple engine (IHttpModule hooks to BeginRequest) to rewrite some URL on the site and everything works perfectly as long as original URL ends with .aspx, example:
http://site/articles/Article-name.aspx rewrites to real location
http://site/DisplayArticle.aspx?name=Article%20name
Tries to use any other URL which DOES NOT end with .aspx results in that Page.Session throws an exception and Page.User is always null (Forms Authentication) Integrated Visual Studio development server works fine in any way, this is only happens when I'm trying local IIS or hoster machine.
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Jul 13, 2010
I am using a Session Arraylist to hold information about an online user. However, I am having troubel accessing the data. The error seems to be in the last bit because I can access one value of sample data just not print out a number of values. I have an class penalyPoint that has the following constructor:
public PenaltyPoint(string penaltyCode1, string penaltyDate1, string PenaltyPointsAwarded1, string penaltyBan1)
Then in a button response I have the following response which holds the data in a session arraylist variable as the user can enter a number of these objects. I will put a capacity limit on the arraylist later on.
//Assign the data in the form to a PenaltyPoint Object
PenaltyPoint penPoint = new PenaltyPoint(ddlPen1Code.SelectedValue, txtPenDate.Text, txtPen1Points.Text, txtPen1Ban.Text);
//The current driver number has to be set before this page is called
//Temp
int currentDriver = 0;
//int currentDriver = (int)(Session["currentDriverNum"]);
//create an arraylist to be used for transferring arraylist to session
ArrayList penPointsDrive0Array = new ArrayList();
if (currentDriver == 0)
{
//if the session is equal to null then nothing has to be returned from session
if (Session["penPointsArrayListDrive0"] == null)
{
penPointsDrive0Array.Add(penPoint);
Session["penPointsArrayListDrive0"] = penPointsDrive0Array;
Response.Redirect("PenaltyPoints.aspx");
}
else
{
penPointsDrive0Array = (ArrayList)Session["penPointsArrayListDrive0"];
penPointsDrive0Array.Add(penPoint);
Session["penPointsArrayListDrive0"] = penPointsDrive0Array;
Response.Redirect("PenaltyPoints.aspx");
}
}
Then I try to access the data in the arraylist but I getting nothing printing out. I am just trying to test the data at the minute. I am not that use to arraylist so this might be the problem.
public partial class TestPage : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
ArrayList answer = new ArrayList();
ArrayList driver1 = (ArrayList)Session["penPointsArrayListDrive0"];
PenaltyPoint ps = new PenaltyPoint();
string output;
for (int i = 0; i < driver1.Count; i++)
{
ps = (PenaltyPoint)driver1[i];
string answertemp = ps.getPenaltyCode();
output = answertemp;
}
}
}
I can't get the final part to collect all the values into a string it keeps on coming up with errors.
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Jul 12, 2010
How can I retain the value of variables that I fill from CodeBehind throughout the session? (C#). For example, I do a LINQ query from the log in "on-Click" button event. The query produces a bunch of data about the user that I want to access throughout the session on additional ASP pages. I know that I can pass a large query string but I suspect that there is a better way. Here's a specific...
from the db function I product: COS=2 (class of service). Throughout the session, I test for COS and display appropriate pages. Assume that the LINQ query is accomplished in the CodeBehind attached to the "loginButton" within the "login.aspx" page.
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Nov 4, 2010
[code]...
How do I correctly define my boolean expression? I've been looking, but haven't found the right syntax.
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Jun 10, 2010
I have a generic handler in which I fill up a Session variable. I implemented the IRequiresSessionState interface, so it shouldn't be a problem.
In a given page, I want to display that value, but it seems like the value is always empty. Is it because the session that is accessed and written to in the handler isn't the same one that is used on this page?
In the handler, I used context.Session["EID"] = "somevalue";
edit: i found out what the issue is but I do not know how to solve it. It's because I have this Java applet which reads out an eID, calls the handler to store the data, but the session used by the applet is not the same as the session used by the browser... so how could I exchange this data in a safe way?
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Oct 2, 2010
User Interface: 2 Labels; 1 Buttons
Requirements: Create a Web Page in ASPx that will do the following:
1)One label will provide a count of how many times Button 1 has been clicked in the current session.
2)One label will provide a count of how many times Button 1 has been clicked by all users of the application. The Application Code for the Button should start at 100 (set this in the Global.asax file). this is what i have so far but i cant seem to get the application state to work properly.
aspx.vb
Partial Class _Default
Inherits System.Web.UI.Page
Dim clickcount As Integer
Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
If Session("ClickCount") Is Nothing Then
clickcount = 0
Else
clickcount = CInt(Session("ClickCount"))
End If
If Not IsPostBack Then
If Request.Cookies("UserName") IsNot Nothing Then
Label1.Text = "Welcome Back " & Request.Cookies("UserName").Value & "."
End If
End If
Dim clickCounta As Integer = CInt(Application("ClickCount"))
End Sub
Protected Sub PostBackSession_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles PostBackSession.Click
clickcount += 1
lblClkCnt.Text = "Current Click Count is " & clickcount
Application.Lock()
Dim clickCounta As Integer = CInt(Application("ClickCount"))
clickCounta += 1
Application("ClickCount") = clickCounta
Application.UnLock()
AppClick.Text = clickCounta
Dim nameCookie As New HttpCookie("UserName", _
TextBox1.Text)
nameCookie.Expires = Now.AddYears(1)
Response.Cookies.Add(nameCookie)
End Sub
Protected Sub PostBackSession_PreRender(ByVal sender As Object, ByVal e As System.EventArgs) Handles PostBackSession.PreRender
Session("ClickCount") = clickcount
Application("ClickCount") = clickcount
End Sub
End Class
global.asax
<script runat="server">
Sub Application_Start(ByVal sender As Object, ByVal e As EventArgs)
Dim clickCounta As Integer = CInt(Application("ClickCount"))
Application.Add("ClickCount", 0)
End Sub
Sub Application_End(ByVal sender As Object, ByVal e As EventArgs)
Dim clickCounta As Integer = CInt(HttpContext.Current.Application("ClickCount"))
End Sub
Sub Application_Error(ByVal sender As Object, ByVal e As EventArgs)
' Code that runs when an unhandled error occurs
End Sub
Sub Session_Start(ByVal sender As Object, ByVal e As EventArgs)
End Sub
Sub Session_End(ByVal sender As Object, ByVal e As EventArgs)
End Sub
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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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Jul 15, 2010
I have a website live in asp.net
now if user closes browser. the session does not get killed.
I spoke with friend and he said that cannot be done as sessions are on server.
but i see banking website who kills session when browser is closed.
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Mar 15, 2011
I have a very basic application with user authentication. I also have a grid in my masterpage that shows all the users logged on. However, after a user logs out, it still shows them to be logged on in the users grid for the duration of the session, which is 20 mins. How do I get the grid to exclude users who've logged out? Here's the code behind for the grid:
[Code]....
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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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Jan 21, 2011
I'm using the following line of code to display the number of users currently logged on:
lblNoOfUsers.Text = Membership.GetNumberOfUsersOnline().ToString()
I'm still debugging my application so it's on the local server. As I debug and stop then debug again, eventually lblNoOfUsers.text turns to "0" instead of "1", even as I'm navigating my application. It only turns to "1" again if I log out and sign back in. It's almost as though Membership.GetNumberOfUsersOnline my login are referencing two different session states. How is this possible? Does asp.net create a new session state cookie each time I start debugging?
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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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Nov 1, 2010
All we have a global ships position tracking website which runs smoothly until IIS application pool recycles.When there is workerprocess recycling looks like session state expires as a result i loose all session data and when customer clicks refresh button he is redirected to login page.
In web.config Session state mode is set to InProc so i changed it to State Server but to my luck i have MAP object which is not serialiazable which is causing the maps from not appearing on the website.I tried adding serializable attribute to the object class but still not succesfull.Our website is accessed by our customers whose count is more than 1000.
Changing the session state mode from InProc to StateServer can really slow down the response time so
Is it good to go further fix the serailizable issues and move to state server?.
Is there any way I can retain my session data when application pool recyles?..
Stopping Application pool from recycling may not be a good idea considering health factor of web server.
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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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Oct 27, 2010
The fix for this error message is to run [Code]..... I have run that uptown, downtown and in my lady's chamber and it does no good, although it never complains. Are there any other possibilities?Details:
IIS Server: v5.1 running on XP. SQLServer 2005 running on a different XP box.Microsoft .NET Framework Version:2.0.50727.3615; ASP.NET Version:2.0.50727.3618 There is an ASPState database on the server, containing only two tables: [Code].... and [Code]..... I did not use [Code].... when I ran [Code]....
.
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Dec 3, 2010
I am building a web app that is limited to one database, therefore I cannot use the ASP.NET config tool. As a quick means of getting this app online, I tried to use a simple session variable. The login page verifies the user's credentials, and if they pass, it sets the session variable to a certain value. All other pages check in the page_load event whether or not the session variable is equal to that value. The problem is that once being logged in for a short while and sending and recieving some data, the session variable resets, and I'm returned to the login page to repeat the process. Here's the basic code from my webforms:
[code]....
Is there some setting I need to change in the web.config file to adjust the cookie timeout or is that only for the config tool authentication methods?
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Feb 13, 2011
Just wanted to know in which type of web applications we can use or its good to use the out proc (SQL Server, State Server) session mode?
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Mar 16, 2011
I write a simple web site in asp.net. In one page i want to delete a folder of web root. When i delete it folder, the all session in project is changed to null. I write a post in this forum. Here is the adress of it post: ([URL]) Some pepole answer me to change the session state mode to StateServer. In default the session state mode is Inproc, and i changed the session state mode to stateServer.but when i changed the session to stateserver this error is appear in application eventlog after two day and my web site dont working in iis. This error is like this:
Event Type:
Warning
Event Source:
ASP.NET 2.0.50727.0
Event Category:
Web Event
Event ID:
1310
Date:
3/12/2011
Time:
1:27:55 PM
User:
N/A
Computer:
WIN2003-00A346F
Description:
Event code: 3009
Event message: Unable to make the session state request to the session state server. Details: last phase='Sending request to the state
server', error code=0x80072749, size of outgoing data=0
Event time: 3/12/2011 1:27:55 PM
Event time (UTC): 3/12/2011 8:57:55 AM
Event ID: a5c8bfd16f74429e820989e8ce8082d0
Event sequence: 10
Event occurrence: 1
Event detail code: 50016
Application information:
Application domain: /LM/W3SVC/1547208020/Root-1-129443938731955000
Trust level: Full
Application Virtual Path: /
Application Path: C:InetpubwwwrootClishareClishare
Machine name: WIN2003-00A346F
Process information:
Process ID: 1276
Process name: aspnet_wp.exe
Account name: WIN2003-00A346FASPNET
Exception information:
Exception type: HttpException
Exception message: Unable to make the session state request to the session state server. Please ensure that the ASP.NET State service is started and that the client and server ports are the same. If the server is on a remote machine, please ensure that it accepts remote requests by checking the value of HKEY_LOCAL_MACHINESYSTEMCurrentControlSetServicesaspnet_stateParametersAllowRemoteConnection. If the server is on the local machine, and if the before mentioned registry value does not exist or is set to 0, then the state server connection string must use either 'localhost' or '127.0.0.1' as the server name.
Request information:
Request URL: [URL]
Request path: /main/home.aspx
User host address: 64.79.69.155
User:
Is authenticated: False
Authentication Type:
Thread account name: WIN2003-00A346FASPNET
Thread information:
Thread ID: 1
Thread account name: WIN2003-00A346FASPNET
Is impersonating: False
Stack trace: Custom event details: For more information, see Help and Support Center at [URL]. When i reset ASP.NET State service, the problem is fixed, but after one or two days, this problem apears again. What's the problem and how can i fix it? And how can i delete a folder in asp.net without the session is lost?
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Apr 21, 2010
Our Web Server rebooted due to power failure. Now ASP.Net State service would not start logging the following error on the server:
Unable to make the Session State Request to the session state server. Last known phase=Sending request to the state server
how to bring back the ASP.Net State service.
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Jan 13, 2011
I am getting this error "The session state information is invalid and might be corrupted " as i hve checked all my session variable initialized with some default value and the existing code works fine in version 1.1 but on conversion it is giving specified error. The error comes when i simply click on a link to redirect to some other page.
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Oct 30, 2010
I created a form where I put some radio buttons. When User select one of them depending upon the option it will start his / her time counter. StartTime and EndTime and I am couting total time he/she takes. Till here it is OK. But what I want when user clicks on Logout, then he/she will logged out (Temporary). and after the some time when he / she will again login..... here, I want to set his / her EndTiming. I don't understand how to maintain this state?
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May 3, 2010
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.
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