Active Directory Object Null Reference

Question

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I made a web application which get the current user login name search in Active Directory and give the complete information about it. My program runs successfully on localhost but after publishing and deploying it to web server IIS it gives the below error.

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.

Source Error: 

An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below.  

Stack Trace: 


[NullReferenceException: Object reference not set to an instance of an object.]
   MasterPage.Page_Load(Object sender, EventArgs e) +94
   System.Web.Util.CalliEventHandlerDelegateProxy.Callback(Object sender, EventArgs e) +51
   System.Web.UI.Control.OnLoad(EventArgs e) +92
   System.Web.UI.Control.LoadRecursive() +54
   System.Web.UI.Control.LoadRecursive() +145
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +772
 


--------------------------------------------------------------------------------
Version Information: Microsoft .NET Framework Version:4.0.30319; ASP.NET Version:4.0.30319.18446

THE PAGE_LOAD OF MASTER PAGE IS

C#

protected void Page_Load(object sender, EventArgs e)
   {
       ActiveDirectoryHelper obj = new ActiveDirectoryHelper();
       if (Page.IsPostBack == false)
       {
           string other = WindowsIdentity.GetCurrent().Name.ToLower();

           string login = Environment.UserName;
           ADUserDetail person = obj.GetUserByLoginName(login);
           string co = person.Company;
           string name = person.DisplayName;
           string dep = person.Department;


           lblUserName.Text = "WellCome: " +name+dep;
       }

Posted 3-Jun-14 18:54pm

shaprpuff

Updated 3-Jun-14 19:35pm

v2

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Comments

ArunRajendra 4-Jun-14 0:57am

Can you post active directory related code?

4 solutions

Solution 1

1.Like the error message said, in Page_Load() at line 94 you are trying to access an null object. So maybe your search didn't find any user object and you forgot to manage this case.

2.In order to give you more advises you should provide the code of your Page_Load() method.

Posted 3-Jun-14 19:05pm

Raul Iloc

Updated 3-Jun-14 19:52pm

v2

Solution 2

I am not sure but I guess the issue could be when you are running from iis it will using the ASPNET user. You might need to impersonate use a logged in user account to run the process. Check this link. http://stackoverflow.com/questions/1267071/how-to-get-windows-user-name-when-identity-impersonate-true-in-asp-net[^]

Posted 3-Jun-14 19:42pm

ArunRajendra

Solution 3

C#

if (Page.IsPostBack == false)
{
    string other = WindowsIdentity.GetCurrent().Name.ToLower();

Where is that code running? Whose credentials are used?
Actually that's a really basic issue of web applications:
you have to differentiate between things happening in the browser (client), and thing happening on the server (IIS).
IIS is running with a local account of the server machine, and consequently your code fails.

Posted 3-Jun-14 20:41pm

Bernhard Hiller

Comments

shaprpuff 9-Jun-14 8:32am

I used
identity impersonate="true" username="Domain\loginname" password="xxxxxxxx"> in web.config
with windows authentication =true, anynomus=disable
now there is no error but only the impersonate name is showing on different machine it should display the current login user details. ON localhost it running fine

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shaprpuff · Accepted Answer · 2014-06-09T19:16:00

Solution 4

Instead of using

1st:

C#

WindowsIdentity.GetCurrent().Name.ToLower();

I replace it with the following.

C#

System.Web.HttpContext.Current.User.Identity.Name;

2nd: Give the User Account

XML

<identity impersonate="true" username="Domain\loginname" password="xxxxxxxx"> </identity>

in web.config

Posted 9-Jun-14 19:16pm

shaprpuff

Updated 9-Jun-14 19:17pm

v2

Comments

[no name] 23-Sep-22 22:17pm

Airfullhaque