Web Forms :: How Come A Null Session Value That Is Called

Sep 13, 2010

how come a Null session value that is called, doesn't get directed to the Custom Error Page?

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Similar Messages:

Web Forms :: Session Variable Is Null When It Shouldn┤t Be Null?

Mar 18, 2010

I have a problem with a SessionVariable. I will explain what is happening:

1. From the default.aspx I send Session["LoginByAdmin"] = "Dummy"; and then redirect to this page where I have the code below. So the Page_Load sees that this Session["LoginByAdmin"] != null and enter this page. This works fine !

2. In the Page_Load, I later fill a ListBox1 with foldernames.

3. With Button1_Click1, I will now delete the choosen Folder in the ListBox1 wich works fine the first time and the ListBox updates the new existing folders in the ListBox. (I have wrapped this inside an updatepanel)

The problems comes now when I try to delete a choosen folder in the ListBox1 the second time in a row. When I select a Folder in the ListBox1 and now Press Button1, I will be redirected to "Default.aspx". This meens that this code is running: (That meens that Session["LoginByAdmin"] == null and I have not set this to null anywhere. This is my big question how this variable can be = null here?

if (Session["LoginByAdmin"] == null)


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Security :: How To Logged In Another Membership Provider Get Null Error When ProviderUserKey Is Called

Jan 28, 2010

If I log in different membership provider, and go to page that contains following code, I get NullReferenceException error. User will be authenticated even if I loggin to different membership.
Is there any ways to prevent from getting error??

If User.Identity.IsAuthenticated Then
Dim UserIdentity As MembershipUser = Membership.Providers("CustMembershipProvider").GetUser(HttpContext.Current.User.Identity.Name, False)
Dim currentUserID As String = UserIdentity.ProviderUserKey.ToString()

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AJAX :: Sys.webforms.pagerequestmanager Is Null Or Not An Object After Called From Outlook 2010

Aug 5, 2010

I am getting "Sys.webforms.pagerequestmanager is null or not an object" error when calling the webpage from outlook for some client machines. In some machines it is working fine.

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Session Being Called Only Once?

Mar 22, 2011

i read that whenenver you call an instance of the your site the session_start is called. I am using the following code to create a visitor counter

void Application_Start(object sender, EventArgs e)
// Code that runs on application startup
Application.Add("Myvariable", 0);


Hence when I run the program the output is "User No:1"

and i copy the url to another firefox tab and paste it there the output is still the same. Isnt it suppose to increment. My session _start is not being called why ?? I was reading a tutorial in which it is being incremented.

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Will Application_end Be Called When All Users Session End

Aug 5, 2010

will the application_end event in global.asax gets called when all users end there session?

was it like this in the past maybe?

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Next SessionID After Session.abandon Is Called?

Jan 25, 2011

To avoid session fixation/hijacking we are heeding the common advice to create a new ASP.Net session for a user after authentication. Sounds simple enough. When a user authenticates we call Session.Abandon() the session ID cookie Response.Cookies.Add(new HttpCookie("ASP.NET_SessionId", "") then redirect the user.

However, how do we know on the new page that the user has logged in? We cannot check a session variable because there are none, we just started a brand new session.

I would swear, though I cannot find it now, that on this site someone explained how you can abandon a session and then get the next subsequent session ID. This way you could store that information. Then on the "Start Page" a new session would begin and that page could look up the old Session based on the new ID and validate that a user logged in.

So, are there any masters of the ASP.Net Session classes that know how to do this?

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AJAX :: Cascading Dropdownlists / Tried A Session Variable But It Comes Up With Session Is Null?

Jul 29, 2010

I have some cascading dropdownlists using the ajax toolkit I have a set up datatables in an xsd file. Then use these in a webservice to populate all the fields ... this all works great but now i need to pass an additional paramter to the first dropdownlist ( a date) but don't know how to do this? The method is below...


The other code is:


The first change would be to the tableadapter to add a param to the code i.e

AuditWebDS.TeamsDataTable teams = teamsAdapter.GetTeams(calldate);

but how do i get the calldate param to the webservice method... i tried a session variable but it comes up with session is null ? Is there another better way?

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HttpHandlers / Modules :: Accessing Session - Get A Null Session Error?

Apr 26, 2010

So I've read quite a few posts about how to do this, and it's still getting me. I'm trying to control access to a directory, but I continue to get a null session error. I'm doing my check in PostAcquireRequestState

[Code]....no matter where I put this, my session always comes back null. I am using IRequireSessionState on the class as well. Am I pulling the context wrong?

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MVC ::Session Variables Called From The Owning Controller?

Feb 19, 2011

I'm calling an action from another controller using this code


But inside "ApproveOperation" action, I needed the Session variables. It seems when I called it from another controller (not the owning controller), the Session variables can not be accessed (null value).How can I get the same Session variables just like it was called from the owning controller?

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State Management :: Called BindProductDetails In ProductDetails.cs - Reading Session Error?

Aug 4, 2010

I have method called BindProductDetails in ProductDetails.cs as follow.

protected void BindProductDetails(int vehicleId)
String sLocale=Some.DataProvider.ListData.GetCulture(System.Web.HttpContext.Current.Session["CountryCode"].ToString());


This method returns culture ="en-US" if CountryCode passed is "US".And GetProductDetails method used in ProductDetails.cs is follow

public static Product GetProductDetails(int productId,string CountryCode,string LanguageCulture)
sLocale = Some.DataProvider.ListData.GetCulture(System.Web.HttpContext.Current.Session["CountryCode"].ToString());[code]....

I try to get sLocale variable to "en-US" if Countrycode passed is "US" in session.I get Object reference not set to an instance of an object error near

StringsLocale=Some.DataProvider.ListData.GetCulture(System.Web.HttpContext.Current.Session["CountryCode"].ToString()); in ProductDetails.cs page.This method works fine in all other page,but here it is showing error.If I hard code Session to US then it works fine.I think it is not reading session.

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Web Forms :: Check Whether Session Is Null?

Aug 27, 2013

If i have a page in which I want to check whether session is null.

If it is null it will redirect to other page.

But i also have a   if (!Page.IsPostBack)

so i will check the session inside this   if (!Page.IsPostBack) or outside it?

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WCF / ASMX :: GetUser() Is Null When WCf In Virtual Directory Is Called In Parent Directory

Nov 10, 2010

I have a WCF service in a virtual directory that is called in the code behind of a page that is in the parent directory, when i debug the code i can see the wcf service is being called, however when the service calls Membership.GetUser() it alway returns null. The user has already logged in to the asp.net site. When i call the service via jquery it does pick up the correct user, but i need to be able to call it via the code behind as well. I am developing in .Net 3.5 how i can make the Wcf pick up the logged in user?

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Web Forms :: Null Values In Session State?

Feb 16, 2010

I need to pass some values around using session state. My approach is to first check if my session variable is null and if it is not, then proceed with my C# logic. Is that correct? Will my Session variable ever contain garbage in it, like a corrupted string? Or will I be guaranteed that it is null if not explicitly set.
if(Session["MyVariable"]!=null {
// Do some logic }

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Forms Data Controls :: How To Catch If Session Is Null

Jul 26, 2010

I want to catch the session if is null how can I do this. My session is:
if it is null
And I want to make a logout button. If he /she press the button session=null then page load and check if the session null going to home page.

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Web Forms :: Why All Session Is Changed To Null When Delete A Folder

Mar 3, 2011

I use the simple code in onunload's body method like this:

onunload="closeIt()"> ... </body>

The closeIt method is call a server method, like this:

function closeIt ()
type: "POST",
url: "mypage.aspx/myFunc",
data: '{}',
contentType: "application/json; charset=utf-8",
dataType: "json",
//async: false,
success: function(response){},
failure: function(response) {
I delete a folder in temp directory in myFunc method. The folder's name is the same of value in Session["id"], like this:
string id = Session["id"];
string temp = "~/temp" + id;
temp = Server.MapPath(temp);
DirectoryInfo dr = new DirectoryInfo(temp);

When the last code( Directory.Delete(dr.FullName) ) is run, the all session in project is changed to null. If i disable the last code( //Directory.Delete(dr.FullName) ) every thing work properly(all session have the value). Why when i enable the last code, all session are null? What's the problem and how can i solve it?

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.net - Session Is Null In PreRequestHandlerExecute?

Dec 14, 2010

In my ASP.NET 4.0 application, I've got an event handler for PreRequestHandlerExecute in global.asax.cs.

I want to access data in the Session. Most times, the session is defined, but sometimes it is null. when it is initialized and when it is not?

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HttpContext.Current.Session Is Null

Aug 20, 2010

I am getting HttpContext.Current.Session is null.Will this be a problem if we have application hosted in web farm.

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.Net Session Is Null In Ashx File/

Jan 28, 2010

If I access session variable in ashx handler through it is always null. How can I access the current user here.

public void ProcessRequest (HttpContext context) {
context.Session[UIConstants.SessionItems.ID] = Id;

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MVC :: Session Is Null With A Hybrid Application?

Apr 2, 2010

I apologize if this question has been asked prior, but I hunted around for about 3 hours today looking for some information. I have taken our existing application and converted it to use both Web Forms and MVC. This application uses multiple modulessuch as Products, Orders, Administration, etc... Each one of those is a web application and a hybrid that is copied into the main application at build time. We are using the Composite Web Application Block to handle our modules and IoC. I have created a Controller Factory that inherits the DefaultControllerFactory and overrides the GetControllerInstance method. However, I commented this out and it still gives the same problem. That problem being that when the controller is in an action, the Session is null. From what I understand, the Handler implements IRequiresSessionState, so the session should not be null. I have tried it out in a smaller, non-hybrid application and the Session is not null. Therefore, it is something that I am missing in the application that I have converted. If anyone has any information on what I might be doing wrong,

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C# - Webpart Context.session Is Null

Mar 25, 2010

I've been using the session array to store a state variable for my webpart... so I have a property like this:

public INode RootNode
return this.Context.Session["RootNode"] as INode;
this.Context.Session["RootNode"] = value as object;

This usually works fine. I've discovered that sometimes, the context.session variable will be null.

I'd like to know what are the conditions that cause the session to be null in the first place, and whats the best way to persist my object when this happens? Can I just assign a new HttpSessionState object to the context, or does that screw things up?

Edit: Ok, so its not just the session that is null... the whole context is screwed up. When the webpart enters the init, the context is fine... but when it reaches the dropbox selectedindexchange postback event (the dropbox contains node id's to use to set the rootnode variable), the context contains mostly null properties.

also, it only seems to happen when certain id's are selected. This looks more like some kind of weird bug on my end than a problem with my understanding of the session.

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Session Is NULL When Running .NET MVC Inside Of .NET

Jul 15, 2010

If I create an ASP.NET Web Application project and then add an ASP.NET MVC 2 to it using the default routes defined like so

"Default", // Route name
"{controller}/{action}/{id}", // URL with parameters
new { action = "Index", id = UrlParameter.Optional }

The Session object is NULL when I try and access it in the action methods of the controllers. If I change my routes to this.

"Default", // Route name
"{controller}.aspx/{action}/{id}", // URL with parameters
new { action = "Index", id = UrlParameter.Optional }

Everything works just fine. For whatever reason having the .aspx extension allows for session to be used, but the later doesn't. I'm using .NET 3.5 for everything.

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C# - Session Object Is Null After Update?

Mar 27, 2011

I'm populating an object model with a linq query. The model looks like this:

DateTime AppointDate {get; set;}
int TotalAppoints {get; set;}
int AppointDuration {get; set;}

The linq-to-sql query looks like that:

public static GetAppointsFromDB(params){
var MyQuery = from....where...
select new MyModel{
AppointDate = ...,
TotalAppoints = ...,
AppointDuration =...};
return MyQuery as MyModel;}

In the master page, I'm looking to load the result of this query in the session like this:

if (Session["Appoints"] == null) {Session["Appoints"] = GetAppointsFromDB(...);}

When I run with the code, the session is always null. I added this line a second time, just right after, and the query runs again. When I'm looking to use the session at some other point in the code, it is null too there too. The query works because when I put a breakpoint on the return statement, I see the object properly filled.

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C# - IHttpHandler Null Session (on Some Servers)?

Jun 25, 2010

I have an IHttpHandler that implements IRequiresSessionState. Everything works fine on most servers but there are 2 servers (one IIS 7.0 and one IIS 7.5) that give me null sessions. Aspx pages are fine on every server. I've searched for hours and failed to find anything that is not related to IRequiresSessionState.

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State Management :: Null Session In IE But Not FF After Deployment

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.

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