How can I add a new user to my system's domain using .Net DirectoryServices?

Question

I want to write a Console application which will just add a new User to my own machine's Domain using .Net DirectoryServices API and LDAP.

Do I need admin account Password for the DomainController to do this ?

Do I need to run that Console Application on a machine on that domain only or can be run on other domains too ?

Can somebody provide me an example ?

UPDATE: Fetching the count of users code

DirectoryEntry myLdapConnection = createDirectoryEntry();
DirectorySearcher search = new DirectorySearcher(myLdapConnection);
search.Filter = "(&objectClass=User)objectCategory=Person)userPrincipalName=*health2.com))";
search.PropertiesToLoad.Add("sAMAccountName");
SearchResultCollection allUsers = search.FindAll();
for (int usersCount = 0; usersCount < allUsers.Count; usersCount++)
{
    SearchResult result = allUsers[usersCount];
    if (result.Properties["sAMAccountName"].Count > 0)
    {
       string cn = result.Properties["sAMAccountName"][0].ToString();
       Console.WriteLine(cn);
       Console.ReadLine();
    }
}
Console.WriteLine(string.Format(@"Users Count - {0}", allUsers.Count.ToString()));
Console.ReadLine();

Answer 1

If you're on .NET 3.5 and up, you should check out the System.DirectoryServices.AccountManagement (S.DS.AM) namespace. Read all about it here:

• Managing Directory Security Principals in the .NET Framework 3.5
• MSDN docs on System.DirectoryServices.AccountManagement

Basically, you can define a domain context and easily find users and/or groups in AD:

// set up domain context
PrincipalContext ctx = new PrincipalContext(ContextType.Domain);

// find a user
UserPrincipal user = UserPrincipal.FindByIdentity(ctx, "SomeUserName");

if(user != null)
{
   // do something here....     
}

The article I provided a link to also shows how easily you can create a new user and add it to AD:

// create a user principal object
UserPrincipal user = new UserPrincipal(ctx, "User1Acct", "pass@1w0rd01", true);

// assign some properties to the user principal
user.GivenName = "User";
user.Surname = "One";
user.UserPrincipalName = "[email protected]";

// force the user to change password at next logon
user.ExpirePasswordNow();

// save the user to the directory
user.Save();

The new S.DS.AM makes it really easy to play around with users and groups in AD!