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Not quite sure, what you intend to do, but you can not logon as user group. The authentication is made by the user, and the user will inherits permissions, which are assigned to groups, the user is member in. 
If you just want to find out information about an AD objects, you should have a look into ADSI-Edit (Windows Support Tools) where you can see the AD structure tree and properties for all AD objects. 

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Hi bembi 
 
1st thanks for reply. 
basically i already told you my userid and password is authenticated now i want to check from which group this user belong to that means i want to verify group name that is valid for this user or not. 
In short i want to getGroup of perticular/authenticated user 
 
I am waiting for your response. 
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Have you had a look into ADSI Edit? As you can define LDAP queries there against AD, you have a good possibility find out the correct structure for your queries. 
Also you may have a look at &quot;Active Directory Explorer&quot; which is part of sysinternal tool suite, you can download from Microsoft. This tool is a lilttle bit better to handle in my mind. Also you have predefined query attributes in cleartext. 
<a href="http://technet.microsoft.com/en-us/sysinternals/default.aspx" rel="ugc">http://technet.microsoft.com/en-us/sysinternals/default.aspx</a> 
For your need, you can use the &quot;memberOf&quot; property of a user object, which contains all groups, the user in member in. But this is a replicated list. The source of authority is not the user but the group object itself. Means, if you query the &quot;memberOf&quot; property, the membership may have changed in the meanwhile but not allready replicated. 
 
The source is the &quot;member&quot; property of the group object. 
If your AD is not changing all the time, you can use both, but to really get sure, the user is member of the group, check again against the group propierties. 
The path depends on the AD structure. 
To find your users, you can query objectCategory=person AND objectClass=user 
To find your groups, you can query objecClass=group 
path is root or one of the root folders 
i.e. <a href="http://ldap://servername:389/dc=xyz,dc=com" rel="ugc">LDAP://servername:389/dc=xyz,dc=com</a> 

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i already used memberof property but when i search.FindOne entry againest, its giving error 
my code is 
 
Public Function GetGroups() As String 
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; Dim search As DirectorySearcher = New DirectorySearcher(&quot;LDAP://servername:389/ou=people,dc=xyz,dc=com&quot;) 
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; search.Filter = &quot;(cn=userid)&quot; 
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; search.PropertiesToLoad.Add(&quot;memberOf&quot;) 
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; Dim groupNames As StringBuilder = New StringBuilder() 
 
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; Try 
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; Dim result As SearchResult = search.FindOne() 
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; Dim propertyCount As Integer = result.Properties(&quot;memberOf&quot;).Count 
 
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; Dim dn As String 
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; Dim equalsIndex, commaIndex 
 
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; Dim propertyCounter As Integer 
 
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; For propertyCounter = 0 To propertyCount - 1 
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; dn = CType(result.Properties(&quot;memberOf&quot;)(propertyCounter), String) 
 
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; equalsIndex = dn.IndexOf(&quot;=&quot;, 1) 
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; commaIndex = dn.IndexOf(&quot;,&quot;, 1) 
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; If (equalsIndex = -1) Then 
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; Return Nothing 
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; End If 
 
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; groupNames.Append(dn.Substring((equalsIndex + 1), (commaIndex - equalsIndex) - 1)) 
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; groupNames.Append(&quot;|&quot;) 
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; Next 
 
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; Catch ex As Exception 
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; Throw New Exception(&quot;Error obtaining group names. &quot;&nbsp;&amp; ex.Message) 
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; End Try 
 
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; Return groupNames.ToString() 
&nbsp; &nbsp; &nbsp; &nbsp; End Function 
 
please check whats wrong in the code?
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I can solve the problem if i get cn againest userid but i can not able to find cn againest userid,tell me how i can get cn. 
 
i am using this code to get cn 
 
result.Properties(&quot;cn&quot;).ToString() 

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Sorry for the delay, I had to replace a mail server, which took some time. 
 
If you have found the solution, please close the question in any way. 
Have a look here how to do this: 
<a href="https://www.experts-exchange.com/help.jsp#hi282" rel="ugc">https://www.experts-exchange.com/help.jsp#hi282</a>
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<div class="content wysiwyg-content">
i am working vb.net desktop application, i am very new in LDAP so i have a problem to authenticate user group in LDAP, since i have authencated user, for user authentication i write this code 
 
&nbsp; Dim entry As DirectoryEntry = New DirectoryEntry(&quot;LDAP://servername:389/ou=people,dc=xyz,dc=com&quot;) 
&nbsp; &nbsp; &nbsp; &nbsp; entry.AuthenticationType = AuthenticationTypes.None 
&nbsp; &nbsp; &nbsp; &nbsp; entry.Username = &quot;uid=&quot; &amp;&nbsp;username &amp;&nbsp;&quot;,ou=people,dc=xyz,dc=com&quot; 
&nbsp; &nbsp; &nbsp; &nbsp; entry.Password = pwd 
 
&nbsp; &nbsp; &nbsp; &nbsp; Try 
 
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; Dim search As DirectorySearcher = New DirectorySearcher(entry) 
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; Dim result As SearchResult = search.FindOne() 
 
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; If result Is Nothing Then 
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; Return False 
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; End If 
 
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; _path = result.Path 
 
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; Return True 
 
&nbsp; &nbsp; &nbsp; &nbsp; Catch ex As Exception 
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;Return False 
&nbsp; &nbsp; &nbsp; &nbsp; End Try 
 
this is working correct now need to authenticate user group i know the user group please send me code for this. 
 
Regards 

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i am working vb.net desktop application, i am very new in LDAP so i have a problem to authenticate user group in LDAP, since i have authencated user, for user authentication i write this code

  Dim entry As DirectoryEntry = New DirectoryEntry("LDAP://servername:389/ou=people,dc=xyz,dc=com")
        entry.AuthenticationType = AuthenticationTypes.None
        entry.Username = "uid=" & username & ",ou=people,dc=xyz,dc=com"
        entry.Password = pwd

        Try

            Dim search As DirectorySearcher = New DirectorySearcher(entry)
            Dim result As SearchResult = search.FindOne()

            If result Is Nothing Then
                Return False
            End If

            _path = result.Path

            Return True

        Catch ex As Exception
                       Return False
        End Try

this is working correct now need to authenticate user group i know the user group please send me code for this.

Regards 


I wanted to Authenticate user group in LDAP

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