Need To Determine Distinguished Name For An OU Using C#

I need to be able to determine the distinguished name for an Active Directory Organizational Unit (OU) using C#. Once I have it I will then be able to insert it into the below statement which is part of a program to get all groups under an OU. Can someone please provide the code to identify the distinguished name or point to a published solution? Thanks.


    PrincipalContext PCTX = new PrincipalContext(ContextType.Domain, DomainName, OUDistingushedName);


Thanks in advance.
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zonkermanAsked:
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Neil RussellTechnical Development LeadCommented:
How are you getting the OU?

An OU is by its very nature a DN. An OU can not exists that is not a full path from the root of the domain. As you must know the path to the OU to get the OU in the first place....

How are you referencing the OU in the first place? What would you pass to the function that returns the DN in your mind?
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zonkermanAuthor Commented:
I already know the OU I need which is in the variable assignment below for OU_ToSearchForGroupsIn.  It's a somewhat lengthy string in a specific format that I understand but I don't want my user's to have to know the format.  They know the name of the OU where the groups are, which for example in the below would be "Finance Dept"   that is all I want them to have to know.   So this is why I want to know know to derive the full formatted string value based on the OU name.  Can it be done and if so how.  I wish there were a function such as the following:  
public String GetDistinguisedNameForOU(String anOU_Name);

I can already derive the Distinguished names for AD groups under an OU but for some reason the code block I currently use won't work on an OU.


try
   {
     OU_ToSearchForGroupsIn = "OU=Finance Dept,OU=Company Apps,DC=XYZCorp,DC=com
     PrincipalContext PCTX = new PrincipalContext(ContextType.Domain, DomainName, OU_ToSearchForGroupsIn);
   
    GroupPrincipal findAllGroups = new GroupPrincipal(PCTX, "*");
    PrincipalSearcher aPrincipalSearcher = new PrincipalSearcher(findAllGroups);
    foreach (var group in aPrincipalSearcher.FindAll())
    {
     try
     {
      }
    }
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zonkermanAuthor Commented:
I found the answer. Basically I had to just use the DirectorySearcher with the filter shown below.  Doing this gives me the distinguished name for an OU name only.    

    String OU_Name ="Finance Dept";
    DirectorySearcher mySearcher = new DirectorySearcher(entry);
    mySearcher.Filter = "(&(objectCategory=organizationalUnit)(name=" + OU_Name + "))";

    SearchResult result = mySearcher.FindOne();

    if (result != null)
    {
       DirectoryEntry directoryObject = result.GetDirectoryEntry();
       distinguishedName = directoryObject.Properties ["distinguishedName"].Value.ToString();    
    }

This site needs more bottom line responses rather than lectures on things people are not asking for.
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zonkermanAuthor Commented:
I selected my own solution because it works and no one else provided a working solution.
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Neil RussellTechnical Development LeadCommented:
Your solution is kind of OK but what happens when you have more that one OU somewhere called, for example, "Data Entry" ?

It will fail.

"This site needs more bottom line responses rather than lectures on things people are not asking for."

THAT'S why we ask questions about what you are trying to do and how you are getting there.  What this site needs is people who are willing to engage with an expert when they are asked a question. We don't ask you for more information because we have time to spare and feel like a chat, it's because we would like to provide the questioner with a foolproof, accurate solution, not something you can find on GOOGLE in five minutes that will kind of work sometimes until you put in into production and then it breaks on your users.
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