Security :: FormsAuthentication.SignOut() Results In System.NullReferenceException?

Aug 26, 2010

I am getting a "System.NullReferenceException" when I call

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Similar Messages:

Security :: FormsAuthentication.SignOut() Doesn't Work For Previous / Back Button?

May 13, 2010

I have a Default(contains the sign-out button) and Login page, once the user is not authenticated, it will always redirect the user to login page.

So the scenario is when the user hit the sign-out button it will redirect him to the login page which is good. My problem is, when the user hits theprevious or back button from the login page,it will still read the authorization cookies and redirect him to the default page. which should not be the case. the user should be redirected to login page when authentication is invalid.

I've read some solutions on the net, but still it doesn't work for me. below are the codes I've used for my sign-out function


By the way, when the user is authenticated, the previous or back button is available/enable for the user.

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Calling FormsAuthentication.SignOut(); After Invalidating The Page?

Nov 21, 2010

Is it possible to validate a user's Username + Password without logging them in? I understand a usual login block will look like this:


With the Membership.ValidateUser() call setting the cookie for the response.

However, there are some additional checks I'd like to perform after the password is confirmed. (Pulling out an expiry date for that user, for example).

Is there a way to do it without just calling FormsAuthentication.SignOut(); after invalidating the page?

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System.Web.Security.FormsAuthentication.Encrypt Returns Null?

Apr 21, 2010

I'm trying to encrypt some userData to create my own custom IPrincipal and IIdentity objects using Forms authentication - I've serialized an object representing my logged in user to Json and created my FormsAuthentication ticket like so:

string user_item = GetJsonOfLoggedinUser();/*get JSON representation of my logged in user*/

System.Web.Security.FormsAuthenticationTicket ticket =
new System.Web.Security.FormsAuthenticationTicket(1,
WAM.Utilities.SessionHelper.LoggedInEmployee.F_NAME + " "
+ WAM.Utilities.SessionHelper.LoggedInEmployee.L_NAME,
DateTime.Now, DateTime.Now.AddMinutes(30), false, user_item);
string encrypted_ticket = System.Web.Security.FormsAuthentication.Encrypt(ticket);
HttpCookie auth_cookie =
new HttpCookie(System.Web.Security.FormsAuthentication.FormsCookieName, encrypted_ticket);

However, the string encrypted_ticket is always null. Is there a limit on the length of the user_item string?

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Web Forms :: Master Page Cannot View After Forms FormsAuthentication.SignOut();

Apr 8, 2010

Created in VS2008

The login page is created with the masterpage and it has the header picture.

After Logout or run FormsAuthentication.SignOut();

The login page is not showing correctly with the header (from master page).

And the setting on the web.config as below:

<authentication mode="Forms">
<forms loginUrl="Login.aspx" name=".ASPXFORMSAUTH">
<deny users="?" />

Is there any reason why the header from masterpage can not be viewed from the login page?

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Security :: What Is The Difference FormsAuthentication.RedirectFromLoginPage And FormsAuthentication.SetAuthCookie

Mar 16, 2010

What is the difference between:



FormsAuthentication.SetAuthCookie(Text_txtUserName.Text, true);

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C# - Adding An Item To A Dictionary Results In A NullReferenceException?

Mar 28, 2011

The following code has only thrown a NullReferenceException a handful of times over the last several months, but I'm not exactly sure why. The code isn't mine, but it looks pretty straight forward to me.


The only thing I can think of is that pageType is null when it's being used as a dictionary key, but apparently that is not possible.

The code that calls it is simple:

protected override void OnLoad(EventArgs e)
_mypage = GetPage();

I also thought that the error might be with the _section.Pages, but section is never null and never sets anything. If .Pages[page] returns null, the MyPage constructor simply returns. So what am I missing?

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VS 2010 - Find Control And Casting Results In NullReferenceException

Apr 16, 2012

I'm using a third party control called an Accordion from Juice UI. Within that control, I have a table with labels.

VB.NET Code:
<juice:Accordion ID="accSwrlHddRepl" runat="server"> 
<juice:AccordionPanel runat="server" Title="HDD Information"> 
<PanelContent> <p> <table style="width: 99%;">
<tr> <td class="style2">
<asp:Label ID="Label2111111" runat="server" Text="Original HDD:"></asp:Label>   

[Code] ....

I can't access the label directly, so I'm trying to use the FindControl method to get it and set it's text property.

VB.NET Code:

CType(Me.accSwrlHddRepl.FindControl("lblFirstHddReplacement"), System.Web.UI.WebControls.Label).Text = "string"

But I get a NullReferenceException. So I moved the label outside of the table and put it just inside the accordion. The same behavior occurs. Then I gave the accordion panel an ID and did FindControl there, but the same issue occurs.

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Security :: Make SignOut For Another User?

Feb 23, 2010

I need to realize for administrator ability to block/unblock user. I do it by following way:


but if this user is already logged that these changes will be only during next login. I need to throw this user to login page in next his request. I have 2 way:

1. Add to verification to each request

2. remove his session

How can I realize second way? I try to do it:


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VS 2008 Get The Following Error: System.NullReferenceException / How To Solve It

Jul 28, 2010

I am having some issues accessing a literal in a usercontrol.

I get the following error: System.NullReferenceException: Object reference not set to an instance of an object. at page.sbPageLoad(String sTypeCD, Int32 iCategoryID, String SortExpression)

Does the following code below look right?

Here is my usercontrol named: topbanner.ascx:



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VS 2008 DataRow Error System.NullReferenceException?

Jul 26, 2010

When I click on my btnMissionary_Click which is suppose to add a datatable row I am getting the following error:

System.NullReferenceException: Object reference not set to an instance of an object. If I add a entry right away it seems to work fine.

Here is my form
HTML Code:
<div id="container">

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MVC :: Null Action Id Returns System.NullReferenceException?

Oct 26, 2010

This is what I'm trying to run:


When I browse to, everything works ok. But visiting produces:Server Error in '/' Application.Object reference not set to an instance of an object.Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code. Exception Details: System.NullReferenceException: Object reference not set to an instance of an object.

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Web Forms :: Chart, RenderControl, & System.NullReferenceException?

Feb 23, 2010

I need to get the html of a chart control built at runtime. When I call .RenderControl, I get System.NullReferenceException. What could the problem be? Is there another way to go about this (saving as image)? Below is my code.


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ServerControl Randomly Null / System.NullReferenceException?

Apr 8, 2010

I got a master page with a server control in it. Randomly the server control is inaccessible from codebehind. This doesn't happen on a specific action (eg a Button click or so). Currently I have no clue what this could be. I don't think it's output caching since this is not explcitly activated and the error happens far to seldom for that. But I'm going to disable caching in the master page explicitly with next deployment.

The control is defined in markup. The accompaning codebehind is:

PGFMainNavi.HasAccessToFunction = HasAccessToNaviItem;
// HasAccessToNavi is a local function

Exception is:

System.NullReferenceException: Object reference not set to an instance of an object

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Security :: Determine User Signout, Or Page Close?

Feb 26, 2010

Im working on a website where users can log into a members area, inside this area they will be able to communicate with other members.

In order to keep an accurate list of who is online and who is not, I would need to update a IsOnline field in my database when they log on and when they exit my website..

The login part is easy, but how can I determine if someone is leaving my website to go to another, or closing the browser.

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Web Forms :: Exception Details In System NullReferenceException - Object Reference Not Set

Mar 16, 2011

i hav e1 drop down list where is is to filter shif code , ddl text field contaoins shift desc and value contains shift code.

when i select particular shift description it has to show all the 7 days shift description on text boxes iam using informix database

i have 1 dropdownlist which contains shiftcode & shift decription. where shift code is datavalue filed and desc is dat text field. ddl is conected to sql datasource.

i am getting this error:

Object reference not set to an instance of an object.


Source File: C:srcAicWappPersonnelShiftTime.aspx.vb Line: 33 Stack Trace:


here is my code..



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Web Forms :: Exception Details - System.NullReferenceException / Object Reference Not Set To An Instance

Sep 23, 2010

i have a Problem, i made a ASP.NET Page with VS2010 and now i want to run it on a iis6 (windows server 2003) and i get the message:


The Source Code of the File is:


Why do this error only come on IIS6?

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DataSource Controls :: Receiving Error - System.NullReferenceException - Object Reference Not Set

Dec 25, 2010

I receive the following error in the code below: System.NullReferenceException: Object reference not set to an instance of an object. When I am logged into the page I do not receive the error. My Code:

Partial Class _Default
Inherits System.Web.UI.Page
Protected Sub SqlDataSource4_Selecting(ByVal sender As Object, ByVal e As SqlDataSourceCommandEventArgs) Handles SqlDataSource4.Selecting
Dim MemUser As MembershipUser
MemUser = Membership.GetUser()
UserID.Text = MemUser.ProviderUserKey.ToString()
e.Command.Parameters("@UserId").Value = MemUser.ProviderUserKey.ToString()
End Sub
End Class

I read the following online: You are trying to use a reference variable who's value is Nothing/null. When the value is Nothing/null for the reference variable, that means it is not actually holding a reference to an instance of any object that exists on the heap. You either never assigned something to the variable, never created an instance of the value assigned to the variable, or you set the variable equal to Nothing/null manually, or you called a function that set the variableto Nothing/null for you. The following is the Arthur's code example and his suggested fix which I am sure is right:

Private Sub TestString()
Dim a As String
If a.Length = 0 Then
End If
End Sub

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Security :: NullReferenceException From Login.Login1_LoggedIn?

May 14, 2010

I'm trying to call a dataadapter funtion to pass browser information to a database table upon logged in. I have also tried not assigning the function to an interget by setting the fucntion to not return a value. However in either case I get the System NullReferenceException.


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Security :: FormsAuthentication.RedirectFromLoginPage In IE8

May 5, 2010

I have the following code in my secure/login.aspx page using .NET 3.5 and VB.NET


I read some articles that mentioned specifying the domain attribute within the <forms tag but that did not seem to work either. e.g.

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System.NullReferenceException: Object Reference Not Set To An Instance Of An Object.

Feb 8, 2010

I am getting error after publishing a website. At debug mode it works fine.

Private Sub fill_ddl_Dist(ByVal _query As String)
Dim con As Connection
con = New Connection

TIP: When you are writing your question, there is a button on the tool bar that wraps the [code] tags around your copy/pasted code. Its the button with a '#' on it. More on tags. They're cool. Check'em out.

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Security :: What Is The Use FormsAuthentication.user.identity

Oct 7, 2010

what is the use formsAuthentication.user.identity

is it one of the property of page

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Security :: FormsAuthentication LoginUrl Messing With CSS?

Apr 23, 2010

I have a login page that is set to the loginUrl property in the authentication section of my web.config file. I am trying to reference a CSS stylesheet, but it doesn't seem to be doing anything. Here is my markup:


I am able to do this just fine on my other page. One thing I noticed was when I click on "View Source" and try to click the link to the stylesheet, it doesn't take me there, and instead changes the "action" property of the form element to this:


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Security :: Password Encryption Using Formsauthentication?

Dec 1, 2010

Just a quick question i've been asked to look at enhancing security but encrypting passwords we store in a db table, essentially the data thats linked to the user account isnt sensitive however its more to stop someone reading passwords out of the table directly etc

I've read multiple ways of implimenting hashing etc i've started using FormsAuthentication.HashPasswordForStoringInConfigFile
//create new salt and update the password
Hashtable newInfo = new Hashtable();
newInfo["salt"] = GenerateFriendlyPassword(5);
string tmppass = FormsAuthentication.HashPasswordForStoringInConfigFile(txtNewPass1.Text.ToString() + newInfo["salt"].ToString(), "SHA1");
newInfo["passwordHash"] = tmppass;

Generate friendly password returns a 5 char string based on a random position in a valid char array containing a - z and 0 - 9At present the functionality is at page level in the code behind, re this is the forms authentication HashPasswordForStoringInConfigFile function thread safe? Or do i need to look at implimenting this in a different wayCheers appreciate your response as im always jubious about multi threading etc,

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Security :: FormsAuthentication.SetAuthCookie () Isn't Working

Jan 8, 2010

In my account controller I am calling FormsAuthentication.SetAuthCookie( emailAddress, rememberMe ).

Response.Cookies has my cookie. However, after the redirect the cookie is gone and the request is not authenticated.

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