.NET Tutorials, Forums, Interview Questions And Answers
Welcome :Guest
Sign In
Win Surprise Gifts!!!

Top 5 Contributors of the Month
david stephan
Gaurav Pal
Post New Web Links

Identify who is logged in

Posted By:      Posted Date: October 15, 2010    Points: 0   Category :.NET Framework
I want to identify who is logged in the windows system so that i can use that userId in my application.

View Complete Post

More Related Resource Links

Identify if the user is logged in from office or home


Our company lets users log in from office, home, and any other location to our network.  How do I determine programatically from which location he is logged in from (Home, Office, or any other location)?

logged in user data


I'm using the defualt membership provider, i created a table and used the gridview on the logged in user page to show his information such as address e-mail phone zip code etc,, how can i do this without writing a code?

I am new to asp.net  i need simple help please?

Users getting logged out because HttpContext.Current is null


We've  been trying to fix this one for a couple years, and I'm just out of ideas, so any help is really appreciated!

We've got a fairly large, complex web application that uses Forms Authentication to authenticate users.  Throughout the application we store and retrieve information about users in the Session object, and in some cases in cookies.  In a couple places we check for the existence of the context, and if it's null we send the user back to the login page to re-establish the session. 

Just a quick run-down of this web app: C#, .NET 3.5, IIS 6, ASP.NET State Service to manage session

As for the session timer, we use our own home-grown timer, which is basically a client-side timer, which is backed up by a check to the SQL database to see when their last activity was.  This seems to work well for us.  It's not perfect, but it allows us to notify the user before the session times out, and allows us to be certain we're not logging a user out before their 60 minutes of inactivity is up.

What's happening is that certain users are being logged out after just a few minutes.  We've eliminated the timer as a cause and believe what's happening is the HttpContext.Current is null, so the user is logged out.  We do not know why the HttpContext.Current is null, and I underst

Fetching the Currently Logged in user Email


Hey Frnds,

I am using the System.DirectoryServices.UserPrincipal.Current.EmailAddress to fetch the Currently logged in users email from AD.

If  debug my sol am getting the Exact mail id of that Particular user for ex:john@in.domain.com.

If i host My Application on iis

And Access my App am getting some other Email id instead of the john@in.domain.com.

I have changed the Application Pool identity to NetWorkService.

Can any one tell what could be wrong




Concurrency: Tools And Techniques to Identify Concurrency Issues


Efficient parallel applications aren't born by merely running an old app on a parallel processor machine. Tuning needs to be done if you're to gain maximum benefit.

Rahul V. Patil and Boby George

MSDN Magazine June 2008

Debug Leaky Apps: Identify And Prevent Memory Leaks In Managed Code


When is the .NET Garbage Collector unable to reclaim memory? The answer might surprise you. Stay tuned.

James Kovacs

MSDN Magazine January 2007

Prevent Concurrent Logins ? [ Already logged in or currest session is still active implementation] ?


Hi Experts ,

I searched over the web but no luck so far and thought of getting some help form gurus .

Did any out really implemented a way to handle concurrent logins ?

Please not that i'm no using either forms authentication or Roles/Memberships , I do have custom authentication for my website .

I'm sure it is someway related  with global.asax file handling something in application events and session events but unable to figure this one out .

Any pointers will highly be valued and appreciated .

Thanks a tonne in advance .

Security trimmed URL throws an error if not logged in

On a Moss 2007 site, using FBA - I have an issue with security trimmed items within Lists.   There is not a problem with direct url links to non-list items.  
For list items - here is the problem, when a user is not logged in and follows a direct url link from an email or newsletter to security trimmed items within a list - it throws an error instead of offering a redirect to login?

More info:  This is only occurring for individually security trimmed list items that have had anonymous access removed.  When a whole list or library has had anonymous removed, the links work fine (login page appears, log in, taken to original link).

Why is that and is there a way to avoid the error?

If it is of help, this is the error. Thanks in advance.

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 insta

Code to get how many users are logged in to the sharepoint site

How to get the users of my sharepoint who are online.....

Thanx in advance,


How to make "UserId" equal to the "logged-in user" in vb code behind


I need to insert a declaration in the codebehind function below that will make the variable "UserId" equal to the "logged-in user". In what way do I need to change the code below (elsewhere in the project, I successfully make reference to basically the same code and make the UserId equal to logged-in user by using this handler expression inside an image control: ImageUrl ='<%# Eval("UserId","Image.aspx?UserId={0}")%>'...But in the case below, the function is not fired by this expression, but rather by CustomValidator). Thanks very much.


Sub ValidateImage(ByVal source As Object, ByVal args As System.Web.UI.WebControls.ServerValidateEventArgs)

        If Request.QueryString("UserId") IsNot Nothing Then
            ' Get the connection string from Web.config.

            Using conn As New SqlConnection(ConfigurationManager.ConnectionStrings("MyDatabaseConnectionString").ToString())
                ' Create a command object.

How To Check if user is already logged to another computer..???

By the way.,, I am new here.... I  am doing a little vb.net windows form project but connected with the internet ... question : how can I check if the user is already login to another computer..??   somebody here please.. ideas.. thanks..... : )    

Windows Identity Foundation Security Token Service can't stay logged in

I'm using the Windows Identity Foundation **(WIF)** Security Token Service **(STS)** to handle authentication for my application which is working all well and good. However I can't seem to get any long running login with the STS. From my understanding I shouldn't care about the client tokens at the application level since they can expire all they want to and it should redirect me to the STS and as long as they're still logged in on the STS it should refresh their application token. Yet it doesn't seem to want to keep them signed in. Here's what occurs in my login.aspx on the STS var cookie = FormsAuthentication.GetAuthCookie(userName, persistTicket); if (persistTicket) cookie.Expires = DateTime.Now.AddDays(14); Response.Cookies.Add(cookie); var returnUrl = Request.QueryString["ReturnUrl"]; Response.Redirect(returnUrl ?? "default.aspx"); Which was taken almost directly from existing application using normal Forms Auth. From my web.config <authentication mode="Forms"> <forms loginUrl="Login.aspx" protection="All" timeout="2880" name=".STS" path="/" requireSSL="false" slidingExpiration="true" defaultUrl="default.aspx" cookieless="UseDeviceProfile" enableCrossAppRedirects="false" /> </auth

Getting Users who logged on in last month

Hi all, Using Sql Server 2005. Is it possible to retrieve from Sql Server the name and times of all users who logged into the server in the last month? Regards Melt

How to get current logged user name using javascript ?

HelloI am using moss with FBA. I got following javascript to get current user login name. It is displaying curent username properly if user is belong to owner group. But whne I logged with another username who is part of member group(Contribute role), it is not displaying name. Please let me know what I am missing?In following javascript I alerted userId, it is coming in both the case <script type="text/javascript" src="/_layouts/JSAPI/SPAPI_Core.js"></script> <script type="text/javascript" src="/_layouts/JSAPI/SPAPI_Lists.js"></script> <script type="text/javascript" src="/_layouts/JSAPI/SPAPI_UserGroup.js"></script> <script type="text/javascript" src="/_layouts/JSAPI/SPAPI_UserProfile.js"></script> <script language="JavaScript"> var curTitle = null; alert(_spUserId); function getCurrentUserName() { var curUserName = null; var lists = new SPAPI_Lists('') var items = lists.getListItems( 'User Information List', '', '<Query><Where><Eq><FieldRef Name="ID"/><Value Type="Counter">' + _spUserId + '</Value></Eq></Where></Query>', // query '<

maxReceivedmessageSize exception is not logged.

HI all,   we have wcf service deployed to production, and we have implemented the interface IErrorHandler to log events into eventvwr when ever an exception is raised in a service method, all is well and its working fine, but all of a sudden we are getting that method "xyz has failed, so i went into the event log to see that exception "nothing was logged" so out of curisoity i turned on tracing and i see the error  that the maxreceived message size has excedded, so i changed the config and everything is working as expected. Note: We use IIS to host this service the issue: why dint wcf log this message and what changes do i need to make so that these kind of errors are logged somewhere your help is appreciated. Thanks -nen  

How to allow anyone to see the data, but only logged in users to edit it?

Hello,Don't know if this is documented anywhere, but I haven't found it yet.Let's say I want to allow anyone visiting a site to see the data. That's fairly easy as DD does this for you.However, I don't want just anyone to be able to edit the data. I only want selected people to be able to do that. I presume DD works with forms authentication as I've seen it mentioned, but I ahven't seen how to do it yet. Anyone able to give some pointers?Assuming that I've got authentication, how do I make it so that the public doesn't see an edit or delete link when viewing data?Thanks for any help

WCF Service stops after throwing a unhandled exception :no user is logged on.

Hi All,       I have written a WCF service which is hosted as a Managed windows service. I consume this service in a web application. The service is built using a httpBasicBinding and security Mode ="none". I'm now getting the following exception, after which the service stops  "An unhandled exception ('System.ComponentModel.Win32Exception') occurred in CMMonitorService.exe [1812]. Just-In-Time debugging this exception failed with the following error: Debugger could not be started because no user is logged on." I had tried changing the security mode to Transport/Message. with windows credential then I get a access to the path denied error. Can anyone provide hint on what am I missing and what would be the appropriate security mode and client credential to use along with basichttpBinding?
ASP.NetWindows Application  .NET Framework  C#  VB.Net  ADO.Net  
Sql Server  SharePoint  Silverlight  Others  All   

Hall of Fame    Twitter   Terms of Service    Privacy Policy    Contact Us    Archives   Tell A Friend