c# - active directory

josephm67
josephm67 used Ask the Experts™
on
Hi,

I need help to access Active directory. I want to get info of user like Display name/first name etc.

I checked few links but I cannot understand how to define LDAP so I can get user info.

Please guide me about it.

Thanks
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Paul JacksonSoftware Engineer
Top Expert 2011

Commented:
Exactly what problem do you have with defining LDAP ? or see this guide and see if it helps :

http://ianatkinson.net/computing/adcsharp.htm
Sr. Software Engineer
Commented:
To access active directory in C# ;

System References
Make sure you have included the following namespaces in your code:
using System.DirectoryServices;
using System.DirectoryServices.ActiveDirectory;

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Directory Entry Object
DirectoryEntry dir = new DirectoryEntry("LDAP://your_domain_name");

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Creating a Search Object and Executing the Search
The DirectorySearcher object searches the Active directory. You can set the filter property to retrieve specific records. I am also using the AND "&" property to combine two conditions.
DirectorySearcher search = new DirectorySearcher(dir);
search.Filter = "(&(objectClass=user)(givenname=First_Name))";

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Search Results
First Create a SearchResult object to get the data from the search
SearchResult searchresult = search.FindOne(); // You can also use the FindAll() method for multiple objects.

   if (searchresult != null)
   {
	foreach(System.Collections.DictionaryEntry direntry in searchresult.Properties) 
                    TextBox1.Text += direntry.Key.ToString() +"\n"; // This will give you all the property names that are set for that particular object 		      

        TextBox1.Text += searchresult.GetDirectoryEntry().Properties["sn"].Value.ToString(); // Here displaying the lastname/surname in simple textbox.
   }

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Hope this helps
-Kishan

Author

Commented:
Hi Kishan,

I tried the code but it is showing me below error:

The server is not operational.

I am trying to access it remotely. The computer where code is running does not have active directory. So, I guess we need to add some credential too or may be IP address as well.

Thanks
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Author

Commented:
What is OU and DC?
Vikram Singh SainiSoftware Engineer cum AD Developer
Commented:
Hi,

I just understand that you are trying to retrieve information about users from AD.

(1) About the error - The server is not operational. This error means your application is not able to talk to AD Server for any reason. The basic cause could be that you are not connected to AD Server directly.

(2) About LDAP connection string - I remember when I wrote program for interaction with AD as purpose of Window Authentication.

So here is the LDAP connection string -

<connectionStrings>
            <add name="ADConnection" connectionString="LDAP://DCRJSO1.DS.XX/OU=USERS,OU=RJSO,OU=MARKETING,DC=DS,DC=XX"/>            
      </connectionStrings>

The bold part in connection string is called Domain Controller of AD. To get it use link - How to find out which Domain Controller my PC is talking to?

The LDAP connection string should be read from Right to Left. So in our case it is saying that connect to DC (domain component) with dots(.) as XX-->DS.

And go to OU (Organizational UnitName) (to understand consider them as sub-directories) named as Users in Rjso in Marketing.

(3) Connect to AD - Code snippet for same.

using System.DirectoryServices;

// adUser is administrator user of AD
// adPass is password for same admin  user
// conStringPath - LDAP connection string

DirectoryEntry AD = new DirectoryEntry(conStringPath, adUser, adPass, AuthenticationTypes.Secure);
        
            using (DirectorySearcher ds = new DirectorySearcher(AD))
            {
                   foreach (DirectoryEntry de in AD.Children)
                {
                    // CN - DisplayName and sAMAccountName - UserLogon
                    logon = de.Properties["sAMAccountName"].Value.ToString();
                    name = de.Properties["CN"].Value.ToString().ToUpper();
                }
            }
        

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Note - I bear no responsibility for any issues caused due to code or any part.

Author

Commented:
thanks

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